California Ag Network

Category: Vegetable Industry

  • California Ag Leadership Foundation Announces New Leadership

    The California Agricultural Leadership Foundation (CALF) has announced the hiring of two individuals to its leadership team, Dwight Ferguson and Abby Taylor-Silva, to lead the organization which operates one of the foremost leadership development experiences in the United States, the California Agricultural Leadership Program (CALP).

    “I am excited to announce that we are cultivating a new way forward as we continue to provide the premier leadership program in the nation,” said CALF Board Chairman Michael Young. “By building a strong team to meet these challenging times, we can continue to grow leaders who make a difference.”

    Ferguson has been selected to serve as president and CEO of the foundation. His predecessor, Barry Bedwell, is retiring after more than four years as CALF’s president and over four decades in representing production agriculture in the state. Ferguson has spent 30 years in the produce and floral businesses, largely in senior leadership roles, at top industry companies. His most recent position was with Naturipe Farms in Salinas, Calif.

    “Dwight has a track-record of growing ag businesses and the teams needed to build them,” said Young. “He is a recognized industry leader who is known for his management, interpersonal and problem-solving skills.”

    Ferguson earned a bachelor’s degree in communications from Ohio University and a master’s degree in management from Aquinas College. He and his wife, Nancy, have two grown children.

    “I could not be happier joining Ag Leadership as president/CEO,” said Ferguson. “I believe in the mission and vision of the foundation and very much appreciate its history, culture and contributions made to California agriculture. I also recognize the excellent quality of its programs and look forward to working with all stakeholders, especially the board, alumni and staff, to build on CALF’s rich tradition of success.”

    Taylor-Silva will serve as the foundation’s executive vice president. She comes to the foundation after ten years as vice president of policy and communications for the Grower-Shipper Association of Central California (GSA), an agricultural trade association spanning the coastal region that includes Monterey, Santa Cruz, San Benito and Santa Clara counties.

    “We are extremely pleased to have Abby join our new leadership team,” said Young. “She is a true servant leader who will help move the foundation forward through these uncertain times.”

    Abby is a native of Monterey and San Benito counties and serves on the boards of the Salinas Rotary Club and the Community Foundation for Monterey County. She is a proud alumnae of the Ag Leadership Program’s Class 45.

    “I am delighted to join this team,” said Taylor-Silva. “The foundation made a distinctive and long-lasting impact on my personal and professional development, providing me with tools, perspective and an awareness-of-self that directly impacted my ability to effectively lead in various capacities. I look forward to the opportunity to build upon this extraordinary program, serve the foundation and support the next generation of California agricultural leaders.”

    The foundation’s board of directors recently welcomed Michael Young to serve as its new chairman. Young, an alumni of Class 35, is principal of Wegis & Young, a diversified farming operation which grows a variety of tree and row crops and manages agricultural property for individual and institutional investors.

    Three alumni of the program have been newly appointed to serve on the foundation’s board: Correen Davis (Class 45), Yissel Barajas (Class 40) and Paul Parreira (Class 44).

    “The addition of our new board members, along with our existing board, round out what is a dynamic leadership group that is reflective of the diverse nature of California agriculture,” said Young. “They, along with our new leadership team, will propel the foundation on a path of new horizons, positive growth and a sustainable future.”

  • Pythium & INSV Infections in Salinas Lettuce Fields

    In 2020 the incidence of Pythium wilt (caused by Pythium uncinulatum) of lettuce has increased in severity and in the number of affected fields. Pythium infections in lettuce fields have been observed frequently, but not always, occurring with INSV infection. As a result, there has been confusion distinguishing between these two diseases and the role of each of them in causing the problems in fields. In this blog we will discuss these two diseases and explain from our current state of knowledge about the disease dynamics occurring in affected fields.

     INSV has been a production problem on lettuce in the Salinas and surrounding valleys for a number of years and in 2020 it continues to be a serious production issue. Pythium wilt of lettuce is a relatively new problem and was first discussed in a blog entry in October 2015 by Steve Koike (https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=19327 ). However, in 2019 and 2020 we have seen an increase in the number of acres affected by Pythium wilt as well as the severity within fields. Given that Pythium is a relatively new problem and the extent of the problem suddenly increased, some growers and PCAs are confronting this problem for the first time. To add to the confusion, at times INSV and Pythium infections are occurring together on the same plants which has caused confusion and has led to much speculation about the role of each disease in the observed damage.

    Symptoms of INSV

    Issues with INSV infections on head and leaf lettuce types are not a new occurrence in the Salinas Valley and many growers and PCAs are familiar with the symptoms and the patterns of infection in the field, especially on romaine. In general, INSV on lettuce causes characteristic patterns of chlorosis and necrosis on the inner leaves of the plant, as well as significant stunting (Photo 1). However, INSV can cause significant necrosis and lesions on and at the base of the ribs of lettuce plants (Photo 2). It should be mentioned that Tomato Bushy stunt virus (TBSV) can cause symptoms that can be confused with INSV and Pythium wilt; however, lettuce dieback symptoms are always seen on the outer, older leaves and the TBSV pathogen is commonly restricted to low-lying areas along the river. In addition, head lettuce varieties and some romaine varieties are resistant to this virus. When in doubt, it is important to have a sample tested. That said, INSV is the overwhelming virus issue facing growers and PCAs in 2020.

    Moderate to severe symptoms of INSV on ribs of romaine.

    Viral vs. Fungal Symptoms

    One important detail about lettuce plants infected with only INSV is that they do not exhibit wilting of the outer leaves of the plant or show root rot or root discoloration. This is important to note because in 2019 and 2020 we have visited many fields where the plants exhibit symptoms of INSV and have wilting older leaves. In these situations,  the roots and crowns of the plants should be examined for symptoms caused by soilborne pathogens such as the wilt pathogens (Fusarium and Verticillium), Sclerotinia, and Pythium. Fusarium and Verticillium do not cause rot on the fine roots or crown. However, they always cause characteristic vascular discoloration in the taproot and crown of the plant. Distinguishing these two pathogens without a laboratory evaluation is not advised, but in general, Fusarium occurs earlier in the crop cycle and often causes a red-to-brown discoloration internally along the taproot and at the base of the crown. Symptoms of Verticillium on the above ground parts of head lettuce become obvious close to harvest; the taproot and crown tissue of infected plants have dark brown-to-black discolorations. Plants with INSV can also be infected with Sclerotinia (S. minor) which is recognized by the characteristic rotting of the crown tissue of the plant and the presence of white, cottony growth and small blacksclerotia (Photo 3). Plants infected with Sclerotinia easily break off at the soil line when you gently tug on them. However, if the plants do not break off at the soil line and do not show any rot on the crown tissue but do exhibit rot on the fine feeder roots or lower down on the taproot, then Pythium wilt is suspected and can be verified by laboratory evaluation.

    Sclerotinia infection on lettuce. Note that it infects and rots crown tissue of the plant.

    Biology and Symptoms of Pythium

    Pythium wilt is caused by the water mold, Pythium uncinulatum. It infects lettuce roots with swimming spores (zoospores) that move to the roots within the water film in the soil. Additionally, it produces a second type of spore (oospore) that allows the pathogen to survive in the soil in the absence of a host plant. Previous studies have reported P. uncinulatum is almost exclusively a pathogen of lettuce and does not cause disease on other vegetable crops. However, it remains unknown whether other crops may contribute to a build-up of the pathogen in the soil. Affected plants will exhibit rotting of the fine and tap roots (Photo 4) and frequently dark discoloration of the inner core of the main root (Photo 5). Symptoms of the above ground parts of the plant include stunting, yellowing, and wilting of the outer leaves and eventual death (Photo 6). Sometimes the plants have a characteristic look where the younger leaves remain upright, but the older leaves are totally wilted down to the soil (Photo 7). This year, we frequently observed fields where plants are infected with Pythium wilt but are also infected with INSV. These mixed infections are confusing and make it more difficult to distinguish what is the cause of the damage. In our experience to date, plants that show foliar symptoms of INSV and that have wilting older leaves are typically infected with both INSV and, in many cases, Pythium wilt. It should be mentioned that we have also observed plants infected with INSV as well as Fusarium.

    Pythium wilt infection of fine lettuce roots.
    Pythium wilt infection on lettuce taproot.
    Mini romaine infected with Pythium wilt.
    Romaine infected with INSV and Pythium wilt. Note that the older leaves are wilted and lay on the ground.

    The distribution of Pythium wilt in a lettuce field can be variable. Earlier in the summer, fields with this disease typically were infected along the upper or lower ends of the field indicating that the disease may be responding to irrigation or drainage issues. It is possible that there may be a difference in the level of infection between sprinkler and drip irrigated fields, but we cannot say anything definitive at this time. The disease has been found from King City to Castroville. There is a significant difference in the susceptibility of varieties. In fields with multiple leaf type lettuce, we have observed significant differences in susceptibility among varieties with red types being less susceptible (Photo 8). Recently, there have been severe losses in some fields. It is not clear as of this writing, but it is possible that the incidences occurred in response to the heat spells. It is likely that diseased plants were not able to withstand the weather stress due to damaged roots or that extra water applied to address the heat may have stimulated the development of Pythium wilt. Another observation we have made is that at times Pythium mostly infects the fine roots higher up on the root system and in other situations it is more severe at the bottom of the taproot (Photo 9) which may indicate disease initiated farther down on the root system. Given that the disease needs a period of soil saturation for the swimming spores to travel to the roots, issues with soil preparation, drainage and irrigation management may affect the severity of the disease.

    Difference in susceptibility of two green leaf lettuces and a green leaf and red leaf lettuce to Pythium.
    Plant with Pythium wilt infection lower down on the tap root (note the plant on the top with healthy fine roots higher up and infected tip of the tap root).

    Research Efforts

    Daniel Hasegawa is conducting research on the epidemiology and spread of thrips and INSV. JP Dundore Arias is working on a project with the California Leafy Greens Research Board monitoring the occurrence of Pythium wilt in the Salinas Valley. He is also characterizing isolates of this disease to better understand the organism and will be conducting preliminary evaluations of the sensitivity of the organism to fungicides. Given the rapid onset of severe damage of Pythium and the continued severity of INSV, we are trying to better understand these diseases and how they may interact. We are interested in receiving samples of Pythium wilt. Please contact Richard (rifsmith@ucdavis.edu) or JP (jdundorearias@csumb.edu) to submit samples.

    Authors: Richard Smith, JP Dundore Arias, Daniel Hasegawa and Steve Koike

    Farm Advisor, UCCE Monterey; Plant Pathology Professor, Cal State Monterey Bay; Research Entomologist, USDA ARS; Director, TriCal Diagnostics, respectively

  • Managing Root-Knot Nematodes in Crop Rotations

    A question came up about managing root-knot nematodes in processing tomato and lima bean rotations.  Root-knot nematodes are tiny worm-like soil dwelling pests that cause root galling on plant roots, resulting in significant yield and quality losses. Symptoms of severe root-knot infestations include patches of chlorotic, stunted, necrotic, or wilted plants. These nematodes also predispose plants to other soilborne pathogens that cause root rot and wilt diseases. For example, a bean variety resistant to infection by the Fusarium wilt pathogen will become susceptible to this disease if infected with root-knot nematodes.

    What is the link between nematodes in tomatoes and limas? Dr. Phil Roberts, Nematologist at UC Riverside shared the following response:

    There are several root-knot nematode species and they differ in their response to resistance in tomato and various bean crops. Most common in our Sacramento Valley area are Meloidogyne incognita and M. javanica. These nematodes are normally controlled by Mi-1 gene based resistant tomatoes, but there are resistance-breaking populations so that could be the reason for the infection on tomato (unless the tomatoes grown were not actually resistant). A further possibility is that the species is M. hapla, which is not controlled by the tomato resistance. M. hapla tends to induce smaller pearl-like galls on tomato roots and is not common in the Sacramento and northern San Joaquin Valleys.

    Root-knot Nematodes Causing Galling on Tomato Roots

    As to rotating with lima beans, limas are susceptible to these root-knot species but there are resistant varieties available. Beja Flor baby lima has strong root-knot resistance. It was bred to contain three resistance genes that do a good job of blocking M. incognita and M. javanica. It yields well with the caveat that Steve Temple (former UCCE legume specialist) used to remark that it is more Lygus bug susceptible than some varieties, so if a grower went with UC Beja Flor they would need to keep up on the Lygus management. UC Luna baby lima has no root knot resistance. Other lines carrying M. incognita (but not M. javanica) resistance are the large limas White Ventura N and UC92.

    If root-knot nematodes are present in a field with a history of Fusarium wilt, choose varieties that are resistant to root-knot nematodes as well as to the particular Fusarium wilt race present when possible. Another option is to rotate with root-knot nematode resistant cowpeas (blackeyes) instead of limas.  Based on host-range tests, some varieties of cowpea have more root-knot nematode resistance than tomato. For example, some root-knot nematode races are virulent and highly pathogenic to Mi-1 gene based resistant tomatoes but not to nematode resistant cowpeas. — By Rachael Freeman Long & Amber Vinchensi-Vahl, UC Cooperative Extension

  • Why Aren’t My Beans Drying Down?

    We cut our blackeye bean (cowpea) research plots at UC Davis almost 3 weeks ago and they’re still too green to harvest. If we tried now, the vines would get wrapped around the threshing cylinder.  Several growers in the Sacramento Valley have mentioned that their corn has sat at the same moisture level for weeks and is not drying down either, as one would normally expect for this time of year. But, nothing is normal this year!

    Why aren’t our crops drying down?

    Tragic fires throughout the West have pushed a lot of smoke and ash into the sky, creating fog-like conditions that reduce the intensity of the sun, shade crops, and lower temperatures. The blanket of smoke is like stepping into the shade under an awning on a 90oF day. This reduced sun intensity has affected the ability of crops to dry down in a timely manner. Increased humidity levels this past weeks haven’t helped either.

    While shading may be good for protecting tomatoes from sunburn with harvests running late due to COVID-related challenges, it is not good for drying down field crops.

    With the smoke finally dissipating, drying conditions are improving. We ended up turning our blackeye bean crop over to increase aeration and help it dry down.  Dry beans are sometimes turned to help dry the crop down, especially if they’re rained on, but the challenge is to be careful to prevent shattering.

    In corn, there aren’t any easy solutions.  One grower said their corn sat at 16.5% moisture for several weeks and finally they had to harvest it anyway. Dryers are available for drying corn and other crops to the proper storage moisture, but as we all know it’s expensive and with low grain prices this affects the bottom line.  — By Sarah Light & Rachael Freeman Long, UC Cooperative Extension

  • Watermelon Master Classes to Educate, Inform & Inspire

    The first of its kind, the Watermelon Virtual Master Classes were arguably one of the largest pivots of the Spring-Summer season for the communications program of the National Watermelon Promotion Board (NWPB). The challenge was to move an NYC-based freelance summertime media event to online: a virtual version for the at-home world of media and influencers to educate, inform and inspire watermelon content and coverage.

    The reinvention of the media event turned into three separate virtual events with three different topics, three different presenters with three sets of recipe ideas, sending out three different curated boxes of watermelon goodies for the media to enjoy and utilize for their Watermelon Master Classes. The strategies were tri-fold:

    • Lean on “Back to Basics” materials to educate at-home cooks on easy ways to get creative with watermelon
    • Leverage “Use the Whole Watermelon” messaging to encourage use of the rind and juice
    • Develop strong relationships with members of the media and influence their watermelon content for months to come

    NWPB spent weeks pitching media contacts from major publications, in a time when much of the country was in a “shelter in place” order, to offer an at-home, free event to create content and excitement about the sweet summer staple. Additionally NWPB provided education focused on a year-round message to extend the seasonal reach and amplify watermelon’s appeal.

    “We confirmed attendees across the country, rather than have to only host those based in the NYC-area. We sent out custom curated watermelon boxes with a mix of items related to each class and related to our brand: a logoed chef’s apron and a new kitchen knife, a cocktail shaker and food pun spatula, etc. The boxes generated excitement and enthusiasm for the classes, and each one was well attended… with the cameras turned ON!” said Stephanie Barlow, senior director of communications.

    Further, the timing of the classes gave many attendees the opportunity to create their own watermelon content this summer, in time for National Watermelon Day and beyond. Several attendees posted on their personal social pages, where media turn into influencers and endorse watermelon recipes, usage ideas and health benefits. In total, NWPB hosted 60 food editors, writers and media dietitians. Their enthusiasm and delight over the events ensures earned media attention for watermelon to come for months.

    “To date, we have nearly 40 social media posts and 15 articles covering these events, which wasn’t even one of the main strategies but it is additional earned content on their personal influencer networks. We look forward to building long lasting partnerships with writers and their publications in the coming year,” said Barlow.

    These were the Watermelon Master Classes:

    ·       Watermelon Wellness with Pam Smith, RDN featuring Salted Watermelon Woju, Watermelon Overnight Oats, Watermelon Poke Salad and a Watermelon Yogurt Smoothie

    ·       The Ultimate Watermelon Workshop with cookbook authors Mark Scarbrough and Bruce Weinstein, creating Thai-inspired Watermelon Rind Salad, Curried Wheatberry Watermelon Salad and Watermelon, and Prosciutto and Mozzarella Skewers

    ·       Summer Sips Watermelon Cocktails with Jordan Catapano from This Girls Walks into a Bar, mixing a Watermelon Rose Sangria, Watermelon Gimlet and a Summer into Fall Cocktail

    Each of the classes incorporated watermelon key messages of health, value, versatility and year-round availability, but also gave attendees the opportunities to ask questions to the hosts or the watermelon experts from NWPB.

    “The engaging questions were rampant throughout all the classes, asking everything from watermelon storage techniques to flavor pairings, or alternative ingredients when you couldn’t find elderflower liqueur or red wheat berries, which effectively made these events much richer than a plain recipe demonstration,” Barlow continued.

    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. For additional information, visit www.watermelon.org.

  • Fusarium Crown Rot in Watermelon

    In late June, I was contacted by a watermelon grower and visited his field near the border of Stanislaus and Merced County. In the field, 50% of the plants showed leaf and vine wilt and about 20% died (see the field image). When I made a closer examination, the color of leaf lesions were chocolate brown and stem appeared to be watery (see leaf and crown images). The grower told me that the field was just harvested once but symptoms were already present beforehand. The field was planted by a 45-ct and mini-watermelon cultivars.

    Vine-declined and wilted watermelon plants from the disease infection.

    An initial suspicion was a fusarium disease and/or a possible Gummy Stem Blight caused by Didymella bryoniae, though this is very uncommon for the watermelon in California. I sent leaf, runner, and stem samples to the UC Davis Fungal Pathogen Lab and the results came back with the Fusarium Crown Rot caused by F. solani f. sp. cucurbitae and possibility of F. falciforme. F. falciforme has not been described to infect watermelon but records showed that it could cause crown rot in muskmelon. Gummy stem blight (Didymella bryoniae) colonies were not recovered from the samples, which did not surprise me because this disease is mostly prevalent in the southeast and north area, such as Georgia, South/North Carolina, and Delaware.

    Unlike fusarium wilt caused by F. oxysporum f. sp. niveum, the vascular system of crown rot infected plants typically does not show discoloration far above soil line, instead, necrotic rot of crown and taproot can be seen. As the disease progresses, the rot on the crown develops from a light-colored, water-soaked area to be darker. Eventually, the entire plant wilts and dies. Evidence indicated that fusarium crown rot is more common on summer squash and pumpkin, however, all cucurbits can be infected.

    Water-soaked, necrotic rot of the crown

    Early planted fields can have a higher chance to be infected as disease is favorably developed under a cooler temperature. Soil moisture does affect the development of the disease. Extremely wet soil especially with drip tape breakage creates a favorable microclimate, which definitely accelerates the reproduction of spores and spread of the disease to other rows. Growers using surface drip irrigation should specifically pay more attention to the tape damage and fix the problem timely.

    Various types of information demonstrate that the pathogen (F. solani f. sp. cucurbitae) is seedborne and survives only for two to three years in soil. A four-year rotation of planting non-cucurbit species is usually chosen for the disease control. In addition, choosing clean seeds or fungicide-treated seeds can reduce disease initiation. More information about the Fusarium crown rot on cucurbits can be found at UC IPM: http://ipm.ucanr.edu/PMG/r116100911.html. – By Zheng Wang, UCCE Vegetable Crops Farm Advisor

  • Fennimore Receives 2020 EurAgEng Outstanding Paper Award

    Steve Fennimore, UC Davis Cooperative Extension Weed Specialist

    Steve Fennimore, UC Davis Plant Sciences faculty member and UC Cooperative Extension weed specialist, and colleagues received the 2020 EurAgEng Outstanding Paper Award for the paper, “Crop Signalling: A Novel Crop Recognition Technique for Robotic Control,” which was published in Biosystems Engineering.

    The research represents a breakthrough in differentiating weeds from crops using machine vision systems. The technology could help California growers address challenges in managing weeds in in dozens of crops with limited herbicide options, and significant hand-weeding costs due to a growing labor shortage.

    “California growers would benefit from improved weeding technology,” said Fennimore. “This technology certainly has commercialization potential by improving the accuracy, speed and reliability of weed/crop differentiation by weeding machines.”

    Rekha Raja, a postdoctoral scholar in the UC Davis Department of Biological and Agricultural Engineering

    Field experiments were successfully conducted for real-time weed control in tomato and lettuce. The paper was a collaborative effort led by first author Rekha Raja, a postdoctoral scholar in the UC Davis Department of Biological and Agricultural Engineering, and included researchers from the UC Davis Departments of Plant Sciences and Plant Biology; UC Cooperative Extensions in Santa Cruz and Monterey Counties; and the Department of Biosystems Engineering at the University of Arizona.

    Awarded by the European Society of Agricultural Engineers, the EurAgEng Outstanding Paper Award is only awarded once every two years and is selected out of all the papers published in Biosystems Engineering. – By Kristin Burns, UCANR

  • Why Aren’t my Blackeye Bean Pods Filling Out?

    Recently, I received a call about a blackeye bean field in the San Joaquin Valley with a lot of bean pods that did not fill out at the tips (photo). I contacted the UC Riverside blackeye bean breeders Drs. Phil Roberts and Bao Lam Huynh and they shared that this problem is primarily caused by heat, which affects pollen viability and thus fertilization. Here’s their response:

    It [lack of pod fill] is the typical male-sterility symptom [lack of pollen viability] associated with extreme temperatures (heat or cold). Based on the planting date you gave, we just checked the temperature in Denair, CA [farm location] and noted that it was quite warm (~100) during the flowering time (40-50 days after planting) and recently during the pod filling stage, so heat must have been a main cause. The symptom could also be more severe if water is limiting.

    Always be prepared with good irrigation management practices for all crops going into heatwaves, like the one we’re having now.  The minimum seasonal irrigation needed to produce a blackeye bean crop being managed for full yield from one pod set is 16 to 18 inches. This estimate includes a pre-irrigation of 4-inches, and irrigations of 4-inches when floral buds first appear, and 8 to 10 inches during 5 to 6 weeks of flowering and pod filling. If additional irrigations are needed during the vegetative stage, one could increase the total irrigation requirement to 20 or more inches. Irrigating for a second flush of pods could require an additional 8 to 12 inches of water. Irrigation requirements are further increased by any water required to leach salts or to compensate for an inefficient irrigation system.

    Additional water may need to be applied during extreme heat events which drive plant transpiration rates to the limit. Make sure to check the soil moisture in the top 12 to 24 inches of the soil profile and apply additional water if the soil is dry. If in doubt about how much additional water is needed, check the reference evapotranspiration (ETo) and make sure to irrigate to replace at least 120% of your daily ETo in your area.  The current (mid to late August) daily ETo in the San Joaquin Valley ranges from 0.25 to 0.30 in/day; make sure your applied irrigation replaces 120% of these values.

    More information on growing blackeye beans can be found in the publication, UC ANR Blackeye bean production

    in California, http://beans.ucanr.edu/files/226601.pdf. – By Rachael Freeman Long, UCCE Farm Advisor

    Lack of pod fill in blackeye bean tips caused by heat, which affects pollen viability and fertilization; water stress can add to this problem, especially during heatwaves. San Joaquin Valley, 2020.

  • Extending the Shelf-Life of Strawberries

    Advances in technology, automation, and remote sensing is a cross-cutting, macro movement in science impacting agriculture outlined in the USDA Science Blueprint (PDF, 2.6 MB). The Science Blueprint guides USDA’s science priorities for the next 5 years, building from past success. Relative to other crops, many specialty crops are more dependent on agricultural labor for production, harvesting, and processing. This is part of a blog series that highlights research investments to advance automation and mechanization for specialty crops.

    We’ve all enjoyed some delicious strawberries this summer, but a short-shelf life can limit that enjoyment. One of the biggest challenges in U.S. strawberry production is managing diseases and pests. The fungal pathogen Botrytis cinerea results in gray mold, or the unappetizing gray fuzz that can quickly appear on strawberries all too soon after we get them home. Growers typically apply fungicides on a weekly basis to control gray mold as well as other fungal diseases.

    Agricultural Research Service (ARS) researchers developed an alternative technology called PhylloLux, which combines Ultraviolet-C (UV-C) irradiation followed by a specific dark period. UV-C kills microbes by damaging their DNA, but doses required to kill fungal pathogens can also damage plant leaves and fruit. ARS researchers found that including a dark period after irradiation prevents activation of a daylight-induced mechanism that repairs DNA damage in microbes and allows for much shorter UV-C irradiation times. The resulting UV-C/dark (UV-C/d) treatment of strawberry plants twice per week, as suggested for commercial application, did not affect nutritional values of strawberry fruit.

    To move the technology to commercial use, ARS scientists first developed a self-propelled, fully automated and programable apparatus that was used for night-time irradiation of strawberries in a high tunnel culture. In 2019, a second robot was developed for autonomous application of UV-C/d in commercial strawberry fields. Preliminary results from two farms in Delaware indicate the UV-C/d application was as good as weekly fungicide sprays.

    The combination of innovation in approach to disease management and in application through new technology is a result of close collaboration between plant pathologists, horticulturists, entomologists and engineers. In fall 2020 larger California pilot tests are planned for targeted pests, including aphids, thrips, scale insects, and slugs.

    PhylloLux is a prime example of innovation in agriculture production as a solution for farmers, consumers, and the environment in support of the USDA Agriculture Innovation Agenda goal to increase U.S. agricultural production by 40 percent while cutting the environmental footprint of U.S. agriculture in half by 2050. Growers can benefit from the resulting drastic kill of fungal plant pathogens causing gray mold, powdery mildew, and anthracnose. The new method is also an effective control for spider mites, further reducing produce loss to growers. Reducing pesticide use improves environmental outcomes and has potential for organic as well as conventional production. And we’ll all benefit from enjoying those strawberries longer.

    This research supports the “value-added innovation” theme outlined in the USDA Science Blueprintand moves us closer to meeting the goals outlined in USDA’s Agriculture Innovation Agenda. – By Dr. Fumiomi Takeda, Research Horticulturist, Dr. Wojciech Janisiewicz, Research Plant Pathologist (retired), Dr. Joseph E. Munyaneza, National Program Leader, Vegetable, Sugarbeet & Greenhouse Crops, USDA Agricultural Research Service

  • Foodservice Campaigns Find New Ways to Promote Watermelons

    Watermelon continues to find its place on menus throughout the country despite the rapidly changing foodservice landscape. Partnering with both quick service and full service national chains in the spring and summer months, the National Watermelon Promotion Board (Board) focused on takeaway- and delivery-friendly options to not only include watermelon on the menu, but keep it top of mind with their customers.

    Juice and smoothies played a prominent role in all of these promotions, allowing operators to experiment with watermelon’s flavor profile, while understanding that away from home, consumers most enjoy watermelon raw, as a snack or with lunch.

    The Board worked with the following foodservice outlets:

    • Another Broken Egg – Chain wide usage in 74 outlets included a fruit side and

      Watermelon Cucumber Cooler. This year, the promotion started earlier in the year (March 17) and, for the first time, the chain tested a savory application, Tacos Verano with Watermelon Salsa.

    • First Watch – Running June 1 through the end of August in 380 locations, the Watermelon Wake Up juice scored a 96/100 for frequency of ordering desire on Datassentials SCORES, a monthly report that tracks and ranks new menu items tested with consumers. Promotions included in-store chalkboards, e-blast, blog post and social.

    • Nektar – Expanded social media promotional elements including Instagram Live and Stories with Nektar founder Alexis Schulze and Board beverage consultant Tony Pereyra, amplified on Board channels. Offerings in 165 units included a smoothie and juice, running from June 15 until Labor Day weekend.

    • Robeks – Custom graphics on Instagram and Facebook promoting the Wailea Watermelon Smoothie, a customer favorite, in 84 locations.

      “Adjusting to operators’ and consumers’ needs was a top priority this year,” said Megan McKenna, Senior Director of Marketing and Foodservice. “Additionally, leveraging

    existing relationships with past partners has made executing programming straightforward and incredibly successful.”

    “You know you have a hit when guests ask for more watermelon salsa on an already generous portion or my favorite, when a guests asked how much for a container to take home because they know a dozen other things that the bright, sweet, spicy, crunchy, salty goodness would go with!” said Jason Knoll, Vice President of Culinary, Another Broken Egg of America Franchising, LLC.

    Looking forward to fall/winter programming, the Board will continue to monitor foodservice needs and consumer trends. For more information about the Foodservice program including how NWPB can support watermelon usage in the foodservice sector, visit watermelon.org/foodservice or contact Megan McKenna at mmckenna@watermelon.org.

    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 Vitamin 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.