California Ag Network

Category: Vegetable Industry

  • Irrigation Strategies to Avoid Heat Damage to Cool Season Vegetables

    Currently, we are experiencing a prolonged heatwave on the central coast.  Heatwaves have become a recurring phenomenon in recent years, especially in late summer. With thousands of acres of cool season vegetables in the ground, irrigation will be critical for keeping crops cool and for supplying enough moisture to meet their water needs.

    Crops can be kept cool by maximizing evapotranspiration (ET).  As liquid water vaporizes heat is lost from the surfaces of leaves and soil and from the surrounding air, which cools the temperature of the crop.  Under water stress leaf stomates close during the hottest period of the day (11 am to 4 pm) and the temperature of the plant tissue can rise above the temperature of the surrounding air.  If the temperature becomes too great leaves and other plant parts may become scorched.

    Since most ranches have a limited number of wells and personnel to irrigate, it is challenging to assure that each field has adequate soil moisture to prevent plants from overheating.   A good strategy is to irrigate just enough to refill the soil profile to the rooting depth of the crop.

    To prioritize which fields to irrigate one should consider the water holding capacity and existing level of moisture of the soil, as well as rooting depth and developmental stage of the crop.  For example, a lettuce crop near maturity with a high ET demand, growing on a sandy textured soil that feels dry, should probably be irrigated soon.  A young lettuce crop with a low ET demand, growing on silt loam soil that still feels moist, likely can be irrigated later without suffering heat damage.

    Another consideration for prioritizing which fields to irrigate are recent field operations.  A recently transplanted vegetable field may need to be irrigated first but may not need a long irrigation to re-saturate the soil around the roots.  A crop that was recently cultivated may have pruned roots, and therefore may need water soon to prevent wilting under these hot conditions.

    Table 1 estimates how much moisture is available to a vegetable crop between saturation and moderately dry or dry conditions for different soil textures.  This table can be a guide for how much water should be applied to re-saturate the soil.  For example, applying 0.42 inches per foot of rooting depth will bring a moderately dry silty clay soil back to saturation.  Applying more than this amount of water will likely over-saturate the root zone.

    Table 1. Estimated plant-available moisture for different textured soils.

    Also, estimating the cumulative crop ET since the last irrigation can guide how long to irrigate. Reference ET values between south Salinas and Soledad during this hot spell have been as high as 0.27 inches per day.  If the crop has a full canopy, 0.25 to 0.3 inches for each day since the last irrigation would be a good rule of thumb for how much water to apply as long as the total does not exceed the water holding capacity of the soil.

    Lastly, one needs to convert the amount of water to apply to an irrigation run-time.  To make this calculation one needs to know the application rate of the irrigation system. For impact sprinklers, the application rate can be estimated using Tables 2-4.  Note that pressure and nozzle size have a significant effect on application rate.  For drip, the irrigation time will depend on the tape discharge rate and pressure, as well as the spacing of drip lines.  Assuming that the drip system is operated at the pressure recommended by the manufacturer (usually 8 to 10 psi) one can use Table 5 to approximate the application rate.  For example, for one drip line of medium flow tape (0.45 gpm/100 ft) on 40- inch wide beds the application rate of the drip system is 0.13 inches per hour. If there are several drip lines per bed then multiply the application rate in the table by the number of drip lines.

    The appropriate run-time can be estimated by dividing the amount of water to apply by the application rate of the irrigation system.  For example, to apply 0.6 inches of water to a field with drip using medium flow tape the water would need to run for 4.6 hours:

    Hours to operate the irrigation system = 0.6 inches of water/0.13 inches per hour = 4.6 hours

    Summary

    Irrigating the right amount of time to bring the soil back to saturation will maximize crop ET during these hot days, and hopefully prevent any heat damage to crops.  Also, consider visiting the CropManage website (cropmanage.ucanr.edu) for further guidance on scheduling irrigations. This online tool can assist growers in quickly estimating how much water to apply to meet crop water needs.

    Table 2.  Sprinkler application rate for varying pressures and nozzle diameters for a solid set spacing of 30 × 30 feet (Rainbird 20JH).
    Table 3.  Sprinkler application rate for varying pressures and nozzle diameters for a solid set spacing of 30 × 33.3 feet (Rainbird 20JH).
    Table 4.  Sprinkler application rate for varying pressures and nozzle diameters for a solid set spacing of 30 × 40 feet (Rainbird 20JH).
    Table 5.  Drip application rates for varying bed widths and tape flow rates estimated for 1 drip line per bed.  Multiply the rate in the table by the number of drip lines per bed to determine the actual application rate.  (For 3 drip lines on an 80-inch bed multiply by 3)
    “— By Michael Cahn, UCCE Farm Advisor, Monterey County”

  • New CA Blackeye Varieties Show Resistance to Cowpea Aphid

    Field trials in the Central Valley with two new varieties of blackeye beans, CB74 and CB77, show impressive resistance to cowpea aphids compared to standard CB46, CB5, and CB50 lines. Four varieties of blackeyes including CB46, CB77, CB74, and CB5 were seeded into a blackeye CB50 field, in single lines on 30-inch beds in the Sacramento Valley in May 2020 (Photo 1). By mid-summer, CB50, CB46, and CB5 were heavily infested with aphids (photo 2), whereas CB74 and CB77 were clean (photo 3).

    Photo 1. Blackeye variety trial, Sacramento Valley, 2020; left to right, CB46, CB77, CB74 (early maturing), and CB2 compared to the standard CB50 line planted in the field on the far left.

    Cowpea aphids are serious insect pests of blackeyes. These aphids can quickly colonize plants and cause injury by direct feeding and injecting toxic saliva into plants, leading to stunted growth or death of plants. Sticky honeydew released by the aphids can stimulate black mold growth on plants, reducing photosynthesis and plant health. Cowpea aphids also vector a number of viral mosaic diseases that can cause serious losses in many crops. Biological control cannot be relied on because natural enemies often appear when cowpea aphid infestations are already high and causing serious damage. Applying pesticides early in the season prevents cowpea aphid infestations but beneficial insects can be destroyed, leading to outbreaks of other insect pests. Thus, the development of cowpea aphid resistant blackeye lines is an important breakthrough in managing this pest.

    Photo 2. Heavy cowpea aphid pressure on blackeye bean CB46 leading to significant yield and quality losses.

    Blackeye beans, also known as cowpeas, or blackeye peas in southern states, are an important food crop worldwide. In California, about 8,000 acres are grown annually for dry or canned blackeye bean markets. These new blackeye bean lines are being developed by the UC Riverside blackeye breeding program, led by Drs. Phil Roberts and Bao Lam Huynh, with support from the California Dry Bean Advisory Board and the US AID Feed the Future Innovation Lab for Legume Systems Research (formerly Innovation Lab for Collaborative Research on Grain Legumes). The aphid resistance and other traits have been introgressed into California Blackeye elite backgrounds using natural selection and new molecular markers to expedite the breeding process. Compared to standard varieties, CB74 and CB77 also have more stable yields resulting from heat tolerance, better tolerance to lygus bugs, and equivalent resistance to Fusarium wilt and root-knot nematodes.

    Photo 3. Adjacent CB77 blackeye plants show high levels of resistance to cowpea aphid infestations.

    Blackeye variety observation trials are being conducted in fields by UCCE Farm Advisors Rachael Long, Sarah Light, and Nick Clark in the Sacramento and San Joaquin Valleys, in collaboration with local farmers. More information on blackeye beans can be found in the Blackeye bean production manual for California, UC ANR 21518, http://beans.ucanr.edu/files/226601.pdf. The lead UC bean breeders hope to have these lines available to farmers within the next few years. – By Rachael Freeman Long, UCCE Farm Advisor

  • Broomrape: a Parasitic Weed in CA Processing Tomato

    Figure 1: Branched broomrape infestation in a processing tomato in California.

    Branched broomrape (Phelipanche ramosa), a weedy parasitic plant that can cause devastating damage to many economically important wide range of broadleaf crops including tomato, cabbage, potato, eggplant, carrot, pepper, beans, celery, peanut and sunflower has recently re-emerged in fields in Central Valley counties in California. This weed utilizes a modified root, called haustorium, to fuse into a host plant root and extract nutrients and water which can greatly reduce productivity or even kill the host depending on the level of infestation, susceptibility of the host, and environmental conditions. Tomato is highly susceptible to branched broomrape. In the United States, California accounted for over 90% of the 12 million tons of tomatoes grown in 2018. Studies in Israel showed that at extreme infestation levels broomrape can cause processing tomato yield losses as high as 70%. The annual losses in tomato due to broomrapes in Israel and Turkey are estimated at $5 and $200 million, respectively. Up to 80% crop loss due to branched broomrape has been reported in tomato in Chile which is highly concerning given the similarity in production systems and broomrape species with California.

     
    Figure 2: A close view of a flowering branched broomrape

    Branched broomrape is currently classified in California as an “A” pest, that is, “an organism of known economic importance subject to California State enforced action involving: eradication, quarantine regulation, containment, rejection, or other holding action”. As a potentially severe economic pest and as a California “A-list” pest, establishment and spread of a branched broomrape in California tomato production regions could cause severe consequences for individual growers and for the entire tomato industry. Currently, discovery of broomrape in a commercial tomato field leads to a hold order and crop destruction without harvest. In addition to branched broomrape, several fields have been reported with infestations of Egyptian broomrape (Phelipanche aegyptiaca), a Q-listed species (that is, having a temporary “A” classification pending determination of permanent rating by California State), causing similar industry and grower concerns.

     
    Figure 3: Hundreds of tiny branched broomrape seeds (0.2 – 0.4 mm) and the single capsule from which the seeds were sourced.

    In the United States, branched broomrape was first reported in 1890, and since then, over 150 occurrences of branched broomrape have been documented. In recent times, reports of branched broomrape in the United States have been increasing; from 7 occurrences in 2015 to 65 in 2019. Branched broomrape has been documented in Texas, Virginia, South Carolina, Illinois, New Jersey, Tennessee, Kentucky, Alabama and California. In California, the first reported case of branched broomrape was in Butte County (1903) and later in Alameda County (1929). Other counties in California with reported branched broomrape detections include Colusa, Sacramento, San Benito, Santa Clara, San Joaquin, Ventura and Yolo.

    Figure 4: Distribution of branched broomrape in California as of November 10, 2019. Data source: Calflora and GBIF 2019

    A severe infestation of branched broomrape in the Sacramento Valley in 1959 prompted an intervention that involved soil fumigation with methyl bromide to target the soil seedbank; this was as an industry-led effort funded through a legislative marketing order program. Branched broomrape became a less significant problem after that effort which involved research, intensive field surveys, and fumigation of infested fields and equipment from 1973 to 1982 that cost over $1.5 million. However, this parasitic weed has recently been detected in several tomato fields in Yolo, Solano (Egyptian broomrape) and San Joaquin Counties. The cause of the re-emergence of the problem remains unclear, although re-introduction or recurrence from long-dormant seed in the soil and subsequent spread have been speculated.

    Figure 5: A branched broomrape plant attached to a volunteer tomato root in a processing tomato field in mid-June.

    The re-emergence of branched broomrape in California is of concern to the processing tomato industry as: 1) the experience in other regions of the world has demonstrated the extreme vulnerability of tomato to branched broomrape parasitism, 2) broomrapes seem likely to rapidly establish and spread in California because of the similarity to the species’ native climate, (3) repeated cultivation of processing tomato in the same fields, (4) the cultivation of a wide range of hosts (e.g. carrot, sunflower, safflower) in California, (5) intensive agricultural practices that could rapidly spread broomrape seeds to uninfested fields, (6) the production of copious number of minute seeds could easily disperse via machinery and irrigation water in the highly mechanized and irrigated cropping systems of California, (7) seed longevity (> 20 years) allows the parasite to persist even in the absence of any hosts, and (8) the major part of the parasite’s lifespan occur underground, making it inaccessible to conventional means of weed control such as cultivation and contact herbicides, (9) some of the important management tools (e.g. herbicides known to be effective in controlling broomrapes) are not yet registered or tested in California, (10) regulatory and environmental challenges with soil fumigation practices.

    Research efforts are currently being made to further understand, and develop detection and control approaches for branched broomrape in tomatoes and other specialty crops in California. For more information about branched broomrape in California, please see:

    http://tomatonet.org/branchedbroomrape

    http://tomatonet.org/img/uploadedFiles/Broomrape/CTRI_2019_NEWSLETTER.pdf

    https://www.plantsciences.ucdavis.edu/news/broomrape-eradication-high-priority-uc-researchers

    – Article By O. Adewale Osipitan, Brad Hanson, Matthew Fatino & Mohsen Mesgaran (UC Cooperative Extension)

  • UnitedAg Celebrates 40 Years of Ag Healthcare

    UnitedAg is celebrating the 40th anniversary of its founding in 1980. In celebration of its achievements, UnitedAg will host a series of virtual events throughout the year to share with its members the challenges and milestones of the last 40 years.

    UnitedAg’s CEO and its Board pictured with CDFA Secretary Karen Ross.

    “Reflecting on the past 40 years, we at UnitedAg are filled with a sense of pride and accomplishment. With the help of meaningful relationships, support, and feedback from our membership, we have made an instrumental impact in the Agricultural Healthcare industry in a powerful and meaningful way,” said Kirti Mutatkar, President and CEO of UnitedAg.

    In 1980, the members of UnitedAg intuitively knew they needed a unique health plan to meet the needs of the agricultural workforce within the state. They sought a health plan that would operate on a non-profit basis, offer a diversity of plan designs, and offer customer service designed to accommodate the needs of the ag employees. These employers created UnitedAg Benefit Trust (an ERISA multiple employer welfare arrangement) that grew from 6 small farms to more than 1,000 companies, associates, cooperatives, and partnering agricultural associations.

    The goal of UnitedAg is to be the most member-centric innovative health benefits provider for agriculture. They believe in always seeking creative ways to improve the healthcare experience of its members. Throughout the years, UnitedAg has developed an array of innovative benefits and services to meet the needs of the ever-changing agricultural industry. Today, UnitedAg proudly represents over 55,000 farmworkers and has grown to over $198 million in annual contributions.

    UnitedAg celebrates the grand opening of its second Health & Wellness Center in Santa Maria.

    “We would like to extend a heartfelt thank you to each member of our UnitedAg family for your steadfast support. Your individual and collective contributions have played an integral part in our on-going success and impact in the agricultural industry,” said Veronica Urzua-Alvero, Vice-Chair of UnitedAg.

    As UnitedAg kicks off its 40th year, the organization looks back at all that they have achieved for the agricultural industry and look forward to the new opportunities that await:

         •   The 40th Anniversary Virtual Happy Hour – UnitedAg hosted a series of virtual happy hour events as an opportunity for members to network, connect, and share memories.

         •   Anniversary Edition Quarterly Newsletter – This special edition of the Quarterly Newsletter will feature memorable moments throughout the 40 years. The newsletter will be available for members in late July.

         •   Memorable Moments – The anniversary video will look back at UnitedAg’s history as well as feature anniversary wishes from long-standing members.

         •   Annual Silent Auction – Benefiting UnitedAg’s Education Foundation, the virtual silent auction will take place on August 14 through August 20.

         •   The Annual Health Benefits Forum – The annual virtual health forum will take place Thursday, August 20, at 9:00 am. This year marks the 7th anniversary of this special event at which top health industry leaders will present the latest health trends.

         •   CFO Forum – Coming early October, the member-focused forum will feature a panel of financial experts. They will offer advice on what they are seeing, what employers can expect, and what the short and long-term impacts of COVID could be for employers.

    Josephine Goodrich, UnitedAg Founder William C. Goodrich & UnitedAg President/CEO Kirti Mutatkar

    A.J. Cisney, Chairman of UnitedAg said, “I have been so fortunate to be involved with United Ag for the last eight years. To witness such transformational growth while keeping the focus on our members has been fun to watch. The culture of service and innovation is second to none. Simply put, nobody in the industry does it better. The foundation that was laid 40 years ago was strong, and we’ve continued to build on it every year since. It has been my honor to serve as Chairman during such an exciting time. Happy Anniversary United Ag! I can’t wait to see what we accomplish next.”

    About UnitedAg

    UnitedAg, celebrating its 40th anniversary in 2020, is a multi-commodity member-owned agricultural trade association dedicated to providing innovative healthcare solutions for a strong and healthy agricultural industry. Headquartered in Irvine, Ca., UnitedAg is committed to bringing innovative solutions to agribusiness by meeting its member’s employee health benefits needs, advocating for ag with lawmakers, and helping members comply with regulations. For more information, visit www.unitedag.org, Facebook, and Twitter @UnitedAgOrg.

  • USDA Accepting Applications to Help Cover Costs for Organic Certification

    USDA’s Farm Service Agency (FSA) announced that organic producers and handlers can apply for federal funds to assist with the cost of receiving and maintaining organic certification through the Organic Certification Cost Share Program(OCCSP). Applications for eligible certification expenses paid between Oct. 1, 2019, and Sept. 30, 2020, are due Oct. 31, 2020.

    “For producers producing food with organic certification, this program helps cover a portion of those certification costs,” FSA Administrator Richard Fordyce said. “Contact your local FSA county office to learn more about this program and other valuable USDA resources, like farm loans and conservation assistance, that can help you succeed.”

    OCCSP provides cost-share assistance to producers and handlers of agricultural products for the costs of obtaining or maintaining organic certification under the USDA’s National Organic Program. Eligible producers include any certified producers or handlers who have paid organic certification fees to a USDA-accredited certifying agent. Eligible expenses for cost-share reimbursement include application fees, inspection costs, fees related to equivalency agreement and arrangement requirements, travel expenses for inspectors, user fees, sales assessments and postage.

    Changes in Reimbursement

    Due to expected participation levels and the limited funds available, FSA revised the reimbursement amount available through fiscal year 2023. Certified producers and handlers are now eligible to receive reimbursement for up to 50 percent of the certified organic operation’s eligible expenses, up to a maximum of $500 per scope.

    This change is will allow a larger number of certified organic operations to receive assistance.  If Congress authorizes additional funding, FSA may provide additional assistance to certified operations that have applied for OCCSP, not to exceed 75 percent of their eligible costs, up to $750 per scope.

    The changes to the payment calculation and maximum payment amount are applicable to all certified organic operations, regardless of whether they apply through an FSA county office or a participating state agency. State agencies that are interested in overseeing reimbursements to producers and handlers in their states must establish new agreements with FSA for fiscal 2020.

    Opportunities for State Agencies

    Today’s announcement also includes the opportunity for state agencies to apply for grant agreements to administer the OCCSP program in fiscal 2020. State agencies that establish agreements may be able to extend their agreements and receive additional funds to administer the program in future years.

    FSA has not yet determined whether an additional application period will be announced for state agencies that choose not to participate in fiscal 2020. States that would like to administer OCCSP for multiple years are encouraged to establish an agreement for fiscal 2020.

    FSA will accept applications from state agencies from Aug. 10, 2020 through Sept. 9, 2020.

    State Agencies must submit the Application for Federal Assistance (Standard Form 424 and 424B) electronically via Grants.gov, the Federal grants website, at http://www.grants.gov.

    More Information

    To learn more about organic certification cost share, please visit the OCCSP webpage, view the notice of funds availability on the Federal Register, or contact the FSA county office at your local USDA Service Center. All USDA Service Centers are open for business, including some that are open to visitors to conduct business in person by appointment only. All Service Center visitors wishing to conduct business with FSA, Natural Resources Conservation Service or any other Service Center agency should call ahead and schedule an appointment. Service Centers that are open for appointments will pre-screen visitors based on health concerns or recent travel, and visitors must adhere to social distancing guidelines. Visitors may also be required to wear a face covering during their appointment.

    To learn more about USDA support for organic agriculture, visit usda.gov/organic.

  • Watermelon Board Launches 2020 Recipe & Carving Challenge

    National Watermelon Promotion Board (NWPB) kicked off its annual consumer recipe contest – but this time with a twist. Unlike in year’s past where consumers were asked to create and submit an original watermelon-focused recipe, in 2020 NWPB tasks fans with putting their own unique spin on existing recipes and carvings found on the newly relaunched watermelon.org website. The contest launched Memorial Day and closes August 21st.

    After visitors chose which recipe or carving they will personalize, home chefs can customize it by swapping out up to five ingredients, changing the way the dish is served or adding something new to the dish. Watermelon fans can then enter the contest two ways: by posting their recipe/carving image to their public profile on Instagram using #WatermelonRecipeContest or at watermelon.org.

    “Not only will this contest be more approachable to consumers who may have been intimidated to create a recipe, but they will have all summer long to experiment with the recipes and carvings from the Watermelon.org website and show us how they add their own unique flair,” says Stephanie Barlow. “Additionally, this time period, more than any other, is all about finding new stay-at-home activities for consumers and continuing to source the best products in health, value and versatility.”

    To help launch the contest on Instagram and gain exposure and momentum for the hashtag #WatermelonRecipeContest, NWPB recruited six influencer partners, all of whom have chosen their own recipe or carving to recreate and inspire their followers. Each partner is scheduled to post images and versatility messaging at different times throughout the summer in order to maintain a steady cadence of contest visibility.

    In addition to pushing fans to master watermelon carving techniques and recipes, the contest helps to drive traffic to the new website and capture user-generated content. Other benefits include:

    • Increase page views and engage with on-site with comments
    • Populates NWPB’s database of assets and editorial content with captured UGC and can use for promotion on owned channels
    • Crowd-sources recipe ranking by interest in entries, as well as tweaks for improvements
    • Incentivizes Instagram posts and tags during peak watermelon visibility showcasing versatility for the people, by the people
    •  Real-time feedback on watermelon techniques and recipe steps

    Prizes will be awarded in three categories including Food, Beverage and Carving. All winners will receive a watermelon prize pack of goodies, plus first place winners will receive a $250 gift card, second place a $100 gift card and third place a $50 gift card. Judging criteria will be a mix of the recipe or carving’s unique spin, visual presentation and appearance.

    For more information about the Recipe & Carving Challenge, including official contest rules and to submit an entry, visit watermelon.org/recipe-challenge prior to August 21, 2020.

    About National Watermelon Promotion Board
    The National Watermelon Promotion Board (NWPB), based in Winter Springs, Florida, was established in 1989 as an agricultural promotion group to promote watermelon in the United States and in various markets abroad. Funded through a self-mandated industry assessment paid by more than 800 watermelon producers, handlers and importers, NWPB mission is to increase consumer demand for watermelon through promotion, research and education programs.

    Watermelon packs a nutritious punch, with each serving providing an excellent source of Vitamin C (25%), a source of Vitamins A (8%) and B6 (8%), and a delicious way to stay hydrated (92% water), with only 80 calories. Watermelon consumption per capita in the United States was an estimated 15.6 pounds in 2019. Watermelon consumption in the United States was approximately 5.1 billion pounds in 2019. The United States exported an additional 321.2 million pounds of watermelon. For additional information, visit www.watermelon.org.

  • Fusarium Root Rot in Seedling Lima Beans

    In May, I looked at a lima bean field in the Sacramento Valley that showed poor seedling emergence scattered throughout the field (photo 1). I sent samples to the UC Davis Plant Pathology lab and the main pathogen consistently recovered from the roots was Fusarium root rot, a fungal disease caused by Fusarium solani f. sp. phaseoli. This pathogen is specific to beans and field peas and will not infect other field crops. A few bean seedlings also had Rhizoctonia and Pythium (also fungal pathogens).

    Finding Fusarium root rot in a lima bean seedling field was a surprise because this disease is most commonly encountered in established fields during mid- to late season, where it is one of the causes of early maturity (“cut out”). Rhizoctonia and Pythium can cause seedling damping-off in dry beans. However, plants usually outgrow these pathogens, particularly if the seed is treated with a fungicide and conditions favor rapid emergence.

    Fusarium solani attacks underground stems and roots of plants. In established plants, early infection is characterized by elongated reddish streaks on the roots. As the disease progresses, these eventually form reddish-brown lesions that will surround the entire root, causing decay. The above ground plant symptoms of affected plants included yellowing, wilting, stunting, and dieback. On seedling plants in the affected field, I observed dieback of the growing point, stems that were a bit swollen, and roots that were brownish and not well developed (Photo 2, diseased roots on left, healthy on right).

    Fusarium root rot causes little damage to healthy plants, but under conditions of plant stress due to drought, poor nutrition, or oxygen-stressed, waterlogged soils, Fusarium root rot can cause plant dieback and yield losses, particularly in fields with a long history of bean production. In this particular lima bean field, soil moisture was lost, causing plants to be extremely water stressed. Crop rotation, use of seed treatments, and closely watching field conditions to ensure plants are not stressed will help manage Fusarium root rot. This disease tends to be a problem in fields with a long history of bean production. More information on diseases in dry beans can be found on the newly revised UC IPM guidelines for dry beans. — By Rachael Freeman Long, UC Cooperative Extension

    Photo 2. Lima bean seedlings infected with Fusarium root rot (4 left plants) compared to healthy roots (3 plants on right).

  • Keeping Pinto Beans Away from the Dark Side

    Pinto beans are good for us. They are nutritious, packed with protein and fiber. They also contain a host of micronutrients like B vitamins and folate.

    But being good isn’t enough for pinto beans. They also need to look good.

    A new variety of slow-darkening pinto beans shows benefits for the entire value chain (Photo by Juan Osorno).

    Typically, pinto beans have a striking mottled pattern of dark and light brown. However, the beans can darken after harvesting.

    Consumers perceive pinto beans with darker colors to be older, harder to cook, and less nutritious than lighter beans.

    “We eat with our eyes,” says Juan Osorno. Osorno is a researcher at North Dakota State University.

    And it’s not only consumers who are skeptical about dark pinto beans. “Farmers see darker pinto bean seeds as being of poorer quality,” says Osorno. “And when farmers try to sell darker beans, they often have to accept discounted prices.”

    That’s a big deal because pinto beans are the most common type of dry bean grown and consumed in the United States.

    In the recent study, Osorno and colleagues describe the process of developing a promising new variety of slow-darkening pinto bean. “The study found no major differences in the agronomic performance of regular versus the slow-darkening pintos,” says Osorno.

    He believes these slow-darkening pinto beans can be a good alternative for the existing pinto bean value chain. “Both farmers and consumers will benefit from it in many ways,” he says.

    For example, the slow-darkening beans cooked faster than regular beans. Needing less time to cook can be a great benefit in areas where cooking fuel is scarce.

    The key advancement has been improving agronomic performance – such as yield and bean size – of the slow-darkening beans. That’s huge progress, because past plants with the slow darkening gene have had many issues associated with agronomic performance.

    For example, one older variety of slow-darkening pinto beans has low yields. Another won’t flower under farming conditions in the United States. Yet another grows in such a way that it makes mechanical harvesting of the beans difficult.

    At the root of these difficulties lies pinto bean genetics. Physical characteristics, such as yield, bean size, or rate of darkening, are all affected by one or more genes.

    Turns out, a single gene – aptly named slow darkening or SD – controls how quickly pinto beans darken after harvesting. Researchers can breed this gene into new pinto bean varieties fairly easily without creating a genetically modified organism (GMO).

    But whenever they incorporated this gene in the past, other genes responsible for lower yields or smaller beans would come along with the slow darkening gene.

    Osorno and colleagues tested several varieties of slow-darkening and regular pinto beans over the past decade. The tests were carried out in research plots in Washington and North Dakota.

    The researchers compared traits such as seed weight, yield, and cooking time between slow-darkening and regular pinto beans.

    The initial tests – from 2010 to 2012 – did not yield encouraging results. The slow-darkening beans performed poorly compared to regular pinto beans.

    But the latest round of field trials using slow-darkening pinto beans was more promising. According to the 2018 tests, the newer slow-darkening pinto bean varieties are catching up to regular varieties in yield and bean size.

    In fact, a second generation of slow-darkening pinto beans is already showing higher yields compared to the previous generation.

    Osorno is encouraged but says there’s still work to be done. “Remember that breeding yields gains in a stepwise manner rather than through big jumps,” he says.

    Read more about this research in Crop Science. This work was funded by Northarvest Bean Growers Association, United States Department of Agriculture National Institute of Food and Agriculture, United States Department of Agriculture Agricultural Marketing Service, and the North Dakota Department of Agriculture.

  • Does Adjusting Soil pH Control Clubroot of Brassicas?

    Clubroot disease  can be a serious production issue for broccoli, cauliflower, and other brassicas in the Salinas Valley. The disease  is caused by a unique organism (Plasmodiophora brassicae) that is closely related to ciliate protozoans but is classified in its own taxonomic group. It survives over 20 years as resting spores in the soil that are released as the clubbed root tissue decays. At temperatures above 65 °F, the resting spores release zoospores that swim to host plant roots and infect through root hairs. Once inside the plant, the organism grows into a large multinucleate plasmodium (a multinucleate mass of protoplasm) which stimulates changes in the plant hormones, resulting in enlarged root cells and the characteristic clubbing of the roots (See photo Below). Root infections by the clubroot pathogen can occur in both acid and alkaline soils; however, acidic soil conditions favor the development of the root symptoms. In addition to the main brassica crops, Plasmodiophora can infect arugula, radish, mustard cover crops, and weeds such as shepherd’s purse and even some grasses. Plants that develop severe root swellings will exhibit above ground symptoms (See Photo Above) indicative of non-functioning root systems, which includes yellowing, wilting, poor growth and stunting, drying and death of lower leaves, and eventual plant death.

    Clubroot in the Salinas Valley is mostly controlled by maintaining soil pH above 7.2 to 7.3 by liming. The high pH does not kill the pathogen but inhibits the formation of the root clubs. Soils where control of clubroot by liming is achieved are called “responsive” soils. However, soils where liming is less effective are called “unresponsive” soils.

    In 2020 we had calls regarding the incidence of clubroot on brassicas. In each situation the grower/PCA had soil lab results that indicated that the soil pH was greater than 7.2. To investigate this situation, a small study was conducted. At three fields soil was collected from symptomatic and asymptomatic areas of the crop and soil pH was determined using a pH meter at the UCCE or UC Davis Analytical Lab. The results shown in Table 1 indicate that clubroot was more severe in soils with lower soil pH levels. These findings are consistent with what we know about clubroot, that higher pH soils should have less concern with this disease.

    So why did clubroot occur in soils that had  test pH values greater than 7.2? It is important to keep in mind that soils have a great deal of inherent variability. The goal is to determine if the soil pH for a 5 or 10 acre field is ≥7.2. This is typically done by collecting 15 – 20 soil cores from various parts of the field and mixing them together as a composite sample. However, if sample collection by chance missed areas of lower soil pH, the lab results may be skewed to represent areas of the field that had relatively higher pH values. If this is the case, such a sample could have an artificially high pH (greater than 7.2) while some parts of the field may have a lower pH value. One way to have greater confidence in the soil pH is to collect more soil cores in fields where clubroot disease has been noted in the past.

    At present, we have not seen evidence in Monterey County that soils are unresponsive to liming or that the liming treatment is failing to control clubroot, given variability in soil pH and pH testing. In our intensive vegetable production system, soil pH tends to decrease over time through the use of ammonium fertilizers. The loss of calcium, magnesium and potassium from crop removal and leaching can also contribute to lower soil pH on lighter soils. Given the longevity of clubroot resting spores in the soil, it is important to maintain a liming program to assure that soil pHs are above 7.2 to 7.3 to thoroughly suppress clubroot throughout the field. – By Richard Smith, UCCE Vegetable Crops & Weed Science Farm Advisor, and Steve Koike, TriCal Diagnostics

    Table 1. Three evaluations of soil pH in clubroot affected fields

    Typical clubbing of broccoli roots

  • Organic Trade Association Honors Jeff Huckaby of Grimmway Farms

    Jeff Huckaby, currently President of Grimmway Farms and Cal-Organic Farms, is being honored by the Organic Trade Association as Organic Farmer of the Year.

    Huckaby started farming organically in 1999 as a farm manager for Grimmway in Bakersfield, California, growing several hundred acres of organic carrots. In 2000, he took over all of Grimmway’s organic farming operations throughout California. A year later, he became general manager of Cal-Organic Farms after Grimmway purchased Cal-Organic to expand their organic operation. Today he still leads the organic operations as President.

    During Jeff’s tenure, he has grown the business from several hundred acres to over 45,000 acres of certified organic vegetables. His commitment to owning the land and building up the soil has allowed Grimmway to convert over 95 percent of its owned land to organic and grow over 65 different organic vegetables each year without the use of any outside growers. Today, Grimmway’s organic footprint has grown to cover multiple growing regions in California as well as Washington, Colorado, Georgia and Florida.
     
    Jeff has been the visionary for Grimmway’s organic program, helping develop year-round programs with most major retailers. His leadership allowed Grimmway to work with Costco to convert all of their carrots to organic. As a result, Grimmway is the sole supplier of carrots for Costco in the U.S. and several other countries. He has educated hundreds of buyers and has been asked to speak at multiple retailer produce training programs. He has given farm tours to hundreds of produce buyers, educating them on what it takes to grow organically and be sustainable. He has spoken at organic conferences and USDA meetings, and has testified before a House Agricultural Committee to emphasize the importance of the National Organic Standards Board. He serves on various agricultural boards and advisory committees.

    His expertise in organic farming has been tapped by regulators, trade associations, elected officials, California Department of Food and Agriculture, and USDA for input into all areas of organic production. Jeff actively represents Grimmway and Cal-Organic Farms in their support of the Organic Trade Association and The Organic Center.
     
    “It is a tremendous honor to be recognized by my peers and fellow members of the trade association. I look at this as one of the greatest awards anyone involved with organic can receive, and I am grateful to accept on behalf of the many dedicated farmers who work alongside me at Grimmway and Cal-Organic Farms,” Huckaby said. “My passion for farming spans four generations of my family and almost every decade of my life. I’ve been growing organic at Grimmway for more than 20 years, and I am proud to have helped build our organic program and expand the Cal-Organic Farms brand. Over these years, I’ve witnessed the commitment, hard work and downright grit among all members of this community who are fighting to ensure a bright future for organic in the U.S. I am deeply proud to help lead in this charge and pave the way for the next generation of farmers. Thank you for your support.”

    The Organic Trade Association’s Annual Organic Leadership Award was established in 1997. Awardees are nominated by their peers and chosen unanimously by the association’s Board of Directors. A complete list of past honorees is featured on our website.
     
    “Each year we look forward to recognizing those within the organic sector who have led with valuable contributions to help grow and expand organic agriculture and products. It is exciting this year to have three organic farmers who together represent the real diversity of what organic farming looks like today in the United States, yet each is a steward of the land, helps feed their communities, and inspires others to do the same.” said Laura Batcha, CEO and Executive Director of the Organic Trade Association.

    The Organic Trade Association (OTA) is the membership-based business association for organic agriculture and products in North America. OTA is the leading voice for the organic trade in the United States, representing over 9,500 organic businesses across 50 states. Its members include growers, shippers, processors, certifiers, farmers’ associations, distributors, importers, exporters, consultants, retailers and others. OTA’s Board of Directors is democratically elected by its members. OTA’s mission is to promote and protect ORGANIC with a unifying voice that serves and engages its diverse members from farm to marketplace. The Organic Trade Association does not discriminate on the basis of age, disability, national origin or ancestry, race, gender, religion, sexual orientation, marital status, political affiliation or military status. Persons with disabilities who require alternate means for communication of program information can contact us at info@ota.com