Category: News

  • Free Business Skills Training Offered to Growers, Ranchers and Food Vendors

    UC Ag and Natural Resources and F3 are offering  free skills training courses to help California growers navigate the hurdles of planning, marketing, social media, capital access and buyer engagement.

    Small- to mid-size growers, ranchers, fishers, food producers and food business owners are invited to join the Business Launchpad, a free, cohort-based business development program designed to help them build stronger, more resilient businesses.

    Growing and preparing exceptional food is only part of what it takes to build a successful food business. Today’s producers are expected to be marketers, financial managers, regulatory experts and sales professionals – all while continuing to farm, ranch, fish or manufacture food products. While they excel at their craft, many people would benefit from developing the business skills needed to grow and sustain their operations.

    “We are recruiting up to 40 participants across the state to be part of a nine-week virtual cohort designed to improve the financial stability and operational resilience of small- to mid-sized agricultural enterprises in California,” said Tracy Celio, regional director of F3 Local Farm and Food Innovation and UC ANR’s Southwest Regional Food Business Center.

    Business Launchpad participants will receive practical instruction from experts on key business topics, including recordkeeping, business planning, access to capital, marketing, branding and food safety. In addition to weekly online sessions, participants will receive individualized technical assistance and have opportunities to connect with peers and buyers in person.

    The fall 2026 cohort will run from October through December 2026. Participants will attend one online session each week, with each session lasting approximately 2.5 hours. Weekly educational sessions and coaching are delivered virtually, while regional networking and resource fair events will be held in person in Northern California, Central California and Southern California.

    The course will cover:

    • Business planning
    • Financial literacy
    • Regulatory compliance
    • Marketing and branding

    Participation will be hybrid with:

    • Virtual courses
    • 1:1 coaching
    • Regional networking events for professional growth

    Applications will be accepted until Sept. 1, and applicants will be notified of acceptance by Sept. 10, 2026.

    Learn more and complete the application for Business Launchpad: Growing Resilient Roots For Food, Farm and Ranch Businesses at https://bit.ly/Foodbizlaunch.

  • August Orchard Tasks With Hyrum – Pistachios

    If you are a Pistachio Grower, be sure to follow to stay updated on monthly tasks in your orchard. Share this with every pistachio grower you know. Read the full Orchard Tasks by Cristian Manzo and Reza Ehsani in the August issue of Pacific Nut Producer Magazine.

  • Sustainability Implemented at Scale Across CA Wine Sector

    The California Sustainable Winegrowing Alliance (CSWA) recently released the 2025 California Wine Community Sustainability Report, which finds that sustainability is being implemented at broad scale across the state, with approximately 70% of California wine grape acreage certified to a sustainability program and more than 90% of California wine produced in a certified sustainable winery.

    Published every five years, the report draws on aggregated vineyard and winery performance data and provides an update on CSWA’s education, outreach, certification and partnership efforts. The latest findings document measurable progress since the 2020 report, including improvement in 65% of the vineyard sustainability criteria evaluated and 53% of the winery criteria.

    “Sustainability has long been part of the heart of California wine, and this report shows how that commitment is translating into meaningful action across the state,” said Allison Jordan, CSWA executive director. “We are proud of the progress growers and vintners have made to conserve natural resources, strengthen their communities and build more resilient businesses, while continuing to look for ways to do even better.”

    Sustainability Participation Continues to Grow
    Participation in sustainability assessment has continued to expand across both vineyards and wineries.

    Since 2021, growers farming 2,745 vineyards covering more than 350,000 acres have used the California Code of Sustainable Winegrowing to assess their operations. That represents a 19% increase in participating vineyards and a 34% increase in acreage.

    During the same period, 282 wineries producing approximately 210 million cases annually have used the Code to assess their operations, representing a 23% increase in winery participation.

    The report’s appendix includes aggregated data for the 144 vineyard and 105 winery best practices in the Code, which helps California winegrape growers and vintners evaluate their sustainability performance and identify practical opportunities for continued improvement.

    Measurable Progress Across Vineyards and Wineries
    As participation has grown, the data also show meaningful improvement in how sustainable practices are being implemented across vineyard and winery operations.

    Vineyard sustainability performance improved in 65% of the evaluated criteria compared with the 2020 report. Highlights include:

    • Soil health: 99% of growers allowed resident vegetation to grow in the vineyard, used cover crops and/or applied compost to encourage nutrient cycling and protect soil structure.
    • Energy efficiency: 97% reduced energy use through water-pump improvements, one of the largest energy-saving opportunities in vineyard operations.
    • Pest management: 85% used cultural practices to manage pests naturally and reduce the need for pesticides.
    • Water efficiency: 83% used micro-irrigation systems that enable targeted irrigation and more efficient water management.

    Winery sustainability performance improved in 53% of the evaluated criteria compared with the 2020 report. Highlights include:

    • Sustainable business strategy: 98% integrated sustainability into their business strategy.
    • Water efficiency: 97% measured and monitored water use to manage it responsibly.
    • Energy efficiency: 96% conducted an energy audit of their winery operations within the past five years to identify savings, control costs and improve operational performance.

    The report also demonstrates the ways growers and vintners are supporting employees, neighbors and local communities:

    • Neighbors: 100% of growers provided neighbors with contact information and responded to community concerns.
    • Contributions: 97% of vintners volunteered or made other contributions to enhance their local communities.
    • Wildlife: 94% of growers allowed resident or native vegetation to grow near local waterways, helping protect water bodies and surrounding habitats.
    • Employees: 90% of vintners encouraged employees to recommend ways to improve operational efficiency and sustainability.

    Expanding Tools, Education and Industry Engagement

    Supporting that progress is an expanding network of tools, education and outreach designed to help growers and vintners put sustainable practices into action and continue improving over time.

    From 2021 through 2025, CSWA expanded its efforts to help vineyards and wineries document, measure and strengthen their sustainability performance. Key accomplishments included the launch of the California Vineyard and Winery Climate Action Toolkit and publication of the fifth edition of the California Code of Sustainable Winegrowing. To date, more than 19,300 participants have attended CSWA educational events.

    CSWA also broadened access to California wine sustainability information through an updated Sustainable Winegrowing Ambassador Course, a redesigned CSWA website, a website highlighting California wine’s sustainability milestones and a consumer-facing certification website.

    The report also reflects several important milestones, including CSWA’s 20th anniversary in 2023, the 15th anniversary of Certified California Sustainable Winegrowing and the 10th anniversary of the California Green Medal Sustainable Winegrowing Leadership Awards.

    “These programmatic accomplishments and industry-wide implementation and certification of sustainable practices demonstrate meaningful progress toward CSWA’s vision of vibrant businesses, stronger communities and a healthier environment,” Jordan said. “They also underscore the California wine community’s leadership and resiliency in addressing today’s most pressing sustainability challenges.”

    — Story contributed by the California Sustainable Winegrowing Alliance

  • UC South Coast REC Bee Team Celebrates 10 Years

    Amid the constant hum of thousands of bees, open hive boxes and volunteers dressed in veils and protective beekeeping suits, the OC Bee Team apiary, hosted at the UC Ag and Natural Resources (UC ANR) South Coast Research and Extension Center (SCREC), celebrated 10 years of education, collaboration and community service.

    The anniversary celebration brought together volunteers, specialists, researchers and members of the Orange County beekeeping community, along with Wendy Mather of UC Davis. Elina Niño, director of the California Master Beekeeper Program, joined the celebration virtually via Zoom. For many participants, the event was also a reunion of people who, over the years, have built a community around caring for honey bees.

    Located in Irvine, the teaching apiary is one of the University of California’s important sites for hands-on beekeeping education. Here, the hives do more than produce honey—they serve as living classrooms where participants learn about honey bee behavior, colony health, pest and disease management and the essential role pollinators play in healthy ecosystems.

    Lindsey Pedroncelli, interim director at SCREC, emphasized the apiary’s unique role within UC ANR.

    “South Coast REC is the first and only Research and Extension Center within UC ANR to host a California Master Beekeeper Program apiary,” Pedroncelli said.

    The program supports educational outreach throughout Orange County while providing hands-on learning opportunities for volunteers, students, beekeepers and community members. According to Pouliquen, the Orange County Bee Team currently has 25 active volunteers who help care for the apiary and support its educational activities.

    Volunteers gather every Tuesday to conduct routine hive inspections. During these sessions, they examine hive boxes, locate queens, check for eggs and larvae, evaluate colony development and determine whether any hive requires special attention.

    The work demands patience, careful observation and teamwork. It also requires trust among participants, as each person plays an important role in ensuring both the safety of the group and the well-being of the bees.

    A Family Built Around Bees

    Over the past decade, the apiary has become much more than a training site. For its members, it represents a place of friendship, collaboration and belonging.

    The dedication and leadership of Karine Pouliquen, apiary manager and lead volunteer for the California Master Beekeeper Program Orange County Bee Team, have been instrumental to the apiary’s success.

    With more than two decades of experience working with honey bees, Pouliquen has mentored and trained countless volunteers. Her leadership, expertise and commitment have helped maintain the apiary as a welcoming and safe environment where people with varying levels of experience can learn directly in the field.

    “The success of the apiary comes from working together as a team, with a common goal and a shared vision,” Pouliquen said.

    During hive inspections, she explains each procedure, carefully observes colony behavior and guides first-time participants through every step. Because colonies in a teaching apiary can sometimes become defensive, making timely decisions is essential to protect both the bees and the people working with them.

    Beyond learning beekeeping techniques, participants also gain knowledge about honey bee biology, pollinator-friendly plants, seasonal changes and the proper use of beekeeping equipment. This work has been made possible through the dedication of volunteers and the continued support of SCREC staff.

    “We’re all volunteers,” members of the group often say – a simple phrase that captures the collaborative spirit that has sustained the apiary for an entire decade.

    Community and Belonging

    For Wendy Mather, co-manager of the California Master Beekeeper Program, one of the most meaningful aspects of the celebration was witnessing the strong sense of unity among the Irvine volunteer team.

    She described the apiary as much more than a place to learn beekeeping skills. Over the years, it has also become a space for friendship, collaboration and belonging.

    During the celebration, Mather noticed Pouliquen talking with another volunteer and was struck by the warmth and affection between them—a connection she described as invaluable.

    That sense of closeness reflects what the apiary has created beyond beekeeping: a community built through years of learning, working and caring for bees together.

    Many people who initially joined to learn about bees have also found lasting friendships, mentorship and a welcoming community where they can exchange knowledge and experiences.

    The participation of Mather in person and Niño virtually reinforced the close connection between university research, practical education and the knowledge volunteers bring back to their communities.

    Ten Years of Bringing Science to the Community

    Every hive inspection presents a new opportunity to learn. Conditions inside a colony can change from one week to the next, requiring volunteers to observe carefully, document their findings and make informed decisions based on what they discover.

    As bees continue flying in and out of the hives collecting nectar and pollen, the team is already preparing for the next chapter.

    Ten years after its founding, the South Coast REC apiary continues to grow—not only as a center for hands-on learning but also as a thriving community united by a shared commitment to protecting pollinators.

    The hum of the bees never stops. Inside the hives, thousands of honey bees work continuously in remarkable coordination. Outside, the volunteers do much the same: they observe, learn, collaborate and care.

    Stepping into an apiary does more than change the way people understand honey bees—it can also transform how they think about stewardship, collaboration and community.

    Apiary Tours 2026

    OC Bee Team volunteers share their knowledge and passion for honey bees with the public through guided apiary tours at South Coast REC. These hands-on experiences offer participants a unique opportunity to step inside the apiary, learn about the work volunteers do to care for the colonies, and discover the important role honey bees and other pollinators play in our environment.

    If you’re interested in seeing the apiary up close and learning directly from the volunteers, upcoming tours are scheduled for:

    Upcoming dates:
    Saturday, August 29
    Friday, September 11

    Time: 9 a.m.–11 a.m.

    Location: South Coast Research and Extension Center, Irvine, California

    Cost: $25 per person. Register online. Credit card payment is required.

    Age requirements: Children ages 12–15 must be accompanied by a registered adult. Youth ages 16–17 may participate without an accompanying adult with a parent or guardian signature.

    What to wear: Personal protective equipment (PPE), including a beekeeper suit, hat, veil and gloves, will be provided for use during the tour. All participants are required to wear closed-toe shoes. Participants are also encouraged to bring a filled water bottle.

    To read more UC ANR news, visit our newsroom at https://ucanr.edu/site/news-and-media.

    Follow @UCANR on LinkedIn, Instagram, X (Twitter), Bluesky, Threads and Facebook. — Story contributed by the UC Ag & Natural Resources

  • New Fusarium Disease Resistant Wheats

    ARS researchers are helping wheat farmers deal with a devastating crop disease. ARS scientists in Lincoln, Neb. released new lines of common and durum wheat with resistance to Fusarium Head Blight (FHB). FHB, commonly known as scab, significantly affects wheat and barley, resulting in approximately $1B in yield losses annually in the U.S. and worldwide.

    ARS scientists used modern and conventional breeding technologies to transfer a new FHB-resistance gene [Fhb7The2] from wild grass to wheat and developed a new germplasm named ‘WGC002’ and many other wheat breeding lines.  These new wheat lines derived from WGC002 have exhibited desirable agronomic traits in addition to FHB resistance across different locations and seasons. They will be released as varieties or germplasm following further development and evaluation. Scientists expect a substantial reduction in U.S. economic losses from wheat crops affected by FHB within a few years if farmers adopt new varieties with this resistance gene. — Story contributed the USDA Ag Research Service

  • Wine Grape Industry Commits Additional Funding to Stop GWSS

    To stop the glassy-winged sharpshooter from spreading a fatal grapevine disease into Northern California, the Pierce’s Disease and Glassy-Winged Sharpshooter (PD/GWSS) Board at the California Department of Food and Agriculture committed $820,000 to the ongoing emergency response.

    Preventing the glassy-winged sharpshooter from becoming established in new areas protects winegrapes and other agricultural and landscape plants. California’s wine industry generates about $73 billion in annual economic activity and supports more than 422,000 jobs statewide. A 2025 economic study estimated that if glassy-winged sharpshooters spread unchecked, outbreaks of Pierce’s disease could cost winegrape growers an additional $56 million a year in lost production and vine replacement.

    Since May, county agriculture officials have been tracking down nearly 10,000 grapevines from a Fresno nursery that may have carried the invasive pest into 40 counties. The Board’s special emergency funding is intended to support those efforts. Officials have contacted more than 3,100 customers who purchased the grapevines, inspected and/or destroyed more than 2,900 plants and set more than 2,700 additional insect traps.

    Glassy-winged sharpshooters have been found on customer plants in 23 counties. Inspections and trapping must continue for at least three years to track if the pest spreads beyond customers’ properties.

    “California’s winegrape industry is facing some of the hardest economic times in a generation, but we recognize what is at stake if this destructive pest becomes established in Northern California,” said Board chair Trey Irwin. “Putting $820,000 from the Board’s limited reserves toward this effort is a major commitment for our industry and shows how seriously we’re taking this threat.”

    The funding comes from assessments paid by California winegrape growers to support pest and disease research and prevention. Since 2001, the Board has invested $99 million in research, outreach, prevention and control for Pierce’s disease, grapevine viruses and the insects that spread them.

    “It is important that we continue with inspections and trapping to closely monitor the situation,” said Michelle Pham, response lead with the CDFA Pierce’s Disease Control Program. “This effort depends on close coordination among growers and county, state and federal agencies. For 25 years, that partnership has helped keep the glassy-winged sharpshooter from spreading throughout California.”

    People who suspect they have found a glassy-winged sharpshooter should contact their local agricultural commissioner’s office (bit.ly/CountyAg). For pictures of the pest and for more information, visit bit.ly/GWSS-Costco.

  • New Investment Aims to Give Growers Another Tool for NOW

    California almond growers know the challenge navel orangeworm brings every season. The pest can reduce crop quality, increase production costs and raise concerns around aflatoxin and marketability. Now, new additional funding is helping continue an industry-backed research effort to advance another tool growers may one day be able to use as part of an integrated pest management program.

    The Foundation for Food & Agriculture Research, the Almond Board of California and Flyttr™ partnered on a nearly $5 million grant to advance development of a biological approach targeting navel orangeworm in almonds and pistachios. ABC is helping fund a portion of the project, reflecting the almond industry’s continued investment in research that supports long-term orchard productivity, crop quality and grower profitability.

    The project centers on Flyttr’s Friendly™ navel orangeworm technology. The concept is simple: release Friendly™ male moths into areas with pest pressure. When those males mate with wild females, no surviving offspring are produced. With continued releases over time, the goal is to reduce the pest population and lower damage pressure in orchards.

    For growers, the significance is not that this replaces today’s best practices. Sanitation, monitoring, mating disruption, timely harvest and well-timed treatments remain important parts of navel orangeworm management. Instead, this research is focused on developing a targeted biological tool that could complement existing programs and help reduce reliance on conventional insecticides over time.

    Navel orangeworm remains one of the costliest pests facing California tree nuts, with industry losses estimated at more than $800 million each year. Damage can affect yield, quality and food safety, which is why the pest continues to be a priority for research, industry collaboration and new technology development.

    Funding from FFAR and industry partners will support the continued work needed to move the technology closer to practical use, including large-scale production systems and field studies. That means the effort is still in development, but it represents an important step toward expanding the number of durable tools available to growers managing navel orangeworm pressure.

    ABC’s role in helping fund this work is part of a broader commitment to support practical, science-based solutions for almond growers. By investing alongside partners, the almond industry is helping advance research that could protect crop value, strengthen pest management options and support the long-term competitiveness of California almonds.

  • Start With the Conversation That Determines Your Orchard’s Future

    Planting an almond orchard has never been a simple decision. But in today’s margin-tight environment, the choice of rootstock and variety combination is more than an agronomic preference — it is a 20- to 25-year business decision that can shape profitability, harvest efficiency, marketability and long-term risk.

    That was the focus of a grower-facing discussion moderated by Almond Board of California’s Michael Roots, with perspectives from Dave Phippen of Travaille and Phippen, Duarte Nursery’s John Arellano and grower Brandon Ribiero, at the 2026 Almond Crack Out event.

    For growers, the main message was clear. Do not make a planting decision in isolation. A new orchard should begin with a practical, sometimes uncomfortable, conversation about water, soil, rootstock, variety, harvest timing, market demand and, most importantly, economics.

    “Know Your Breakeven Cost Per Pound”

    Ribiero put the economics plainly when he said growers should “know your breakeven cost per pound.”

    That calculation should sit at the center of every planting conversation. Ribiero described it as a simple equation of cost divided by yield. If a grower expects production costs of $3,500 per acre and assumes 2,500 pounds per acre, the breakeven is about $1.40 per pound. If debt, land costs or other obligations push total costs to $4,500 per acre at the same yield, that breakeven rises to $1.80 per pound.

    That difference matters. In a market where prices can move quickly and margins can narrow, the wrong yield assumption, or the wrong rootstock and variety combination for a site, can make an orchard difficult to carry through the low points of the price cycle.

    Ribiero also warned that growers cannot always “save their way to prosperity.” Trimming some costs may help at the margins, but yield is often what moves the breakeven number in a meaningful way. That makes variety performance, rootstock fit and realistic production expectations central to the decision.

    Start With Water, Soil and Site Limitations

    Before selecting a variety, Ribiero said growers should first understand “all things water” — supply, quality and rights. Without water, he noted, the rest of the planting plan loses its foundation.

    From there, the conversation moves to soil. The right rootstock depends on what the site needs most, including vigor, anchorage, salt tolerance, disease resistance, replant tolerance or other characteristics. Prior Almond Board coverage of rootstock selection has emphasized the same point. Growers should identify a site’s limitations first, then select a rootstock that helps address the biggest risks.

    That means soil tests, water quality information, local grower experience and advisor input should all be part of the planning process. Once trees are planted, growers can adjust irrigation and fertility programs, but they cannot easily redo rootstock selection, variety choice or pre-plant soil preparation.

    Bring the Right People Into the Conversation Early

    Roots framed the panel around a gap that often appears in orchard planning. Growers may talk with a nursery early, but the handler is sometimes brought in after planting decisions are already made, or never at all. The panelists encouraged growers to widen the conversation before committing to trees.

    That group should include the nursery, handler, pest control adviser, neighboring growers and other trusted advisors who understand the region. Arellano said a nursery representative should be prepared to answer questions across rootstock, variety, fit for the site and how the planting will work operationally. If he does not have an answer, he said, the next step is finding someone who does.

    Ribiero said he often asks similar questions of different people one-on-one, looking for patterns in the answers. Where the advice is consistent, growers gain confidence. Where there are outliers, that is where the next question should be asked.

    Marketability Should Not Be an Afterthought

    Phippen brought the handler perspective into sharp focus. A variety may look attractive on paper, and a nursery may be able to supply the trees, but the buying public ultimately determines how that almond is valued. Market classification, quality expectations, defects, customer preferences and regional demand all matter.

    For Phippen, that means the marketing team should be part of the decision-making process. They can help growers understand what is moving well, what may be oversupplied and what buyers are asking for. A grower may be able to produce a variety, but the better question is whether the market wants it, and at what price.

    That conversation is especially important because handlers may serve different customers and markets. Quality tolerance, product form, timing and buyer preference can vary. A variety that fits one handler’s program may not be the right fit for another.

    Do Not Overcomplicate the Orchard

    One of Ribiero’s lessons from experience was the value of simplicity. He described a planting with multiple varieties intended to hedge risk around bloom, pollination and market movement. In practice, that complexity created harvest inefficiency without delivering a better return.

    His takeaway for growers was direct. Do not overthink it. A planting plan that is efficient, repeatable and well-matched to the site may provide more long-term value than one built around too many assumptions. Simplicity can reduce operational headaches and make it easier to scale what works.

    Pre-Plant Work Is the Last Chance to Get Some Things Right

    The panel also emphasized the importance of pre-plant groundwork and amendments. Ribiero noted that once an orchard is planted, it is difficult to incorporate materials into the active root zone. If a site needs amendments such as lime, gypsum, sulfur or compost, pre-plant is often the best opportunity to get them where they need to be.

    That point ties directly back to economics. A grower may be tempted to trim development costs up front, but those savings can become expensive if poor preparation limits tree performance for the life of the orchard.

    A Grower’s Pre-Planting Checklist

    • Calculate your breakeven cost per pound using realistic cost and yield assumptions.
    • Confirm water supply, water quality and water rights before moving deeper into planning.
    • Match rootstock to soil conditions, site limitations and long-term orchard goals.
    • Ask your handler how the variety fits current and future market needs.
    • Talk with neighboring growers who have experience with similar soils, water and varieties.
    • Include your PCA, nursery representative, handler and trusted advisors early.
    • Review independent field data and regional trial information where available.
    • Keep the orchard design practical for harvest timing, equipment and labor efficiency.
    • Complete needed soil preparation and amendments before planting.

    The Bottom Line

    Choosing an almond rootstock and variety combination is not just a horticultural decision. It is a business plan, a risk-management strategy and a long-term commitment to a specific site. The most successful planting decisions begin before the nursery order is placed, with honest conversations about what the orchard must produce, what the market will reward and what the grower can afford.

    For growers considering a new planting, Ribiero’s advice is a practical place to start. Know your breakeven cost per pound. From there, every other decision — water, soil, rootstock, variety, marketability and orchard design — should help answer one question. Can this orchard make money through the full price cycle? — Story Contributed by the Almond Board of California

  • Precision Timing Critical for Managing Hull Rot

    With this season’s hull rot treatment window now behind growers, recent research shared by UCCE advisors offers timely guidance for evaluating disease pressure this year and planning more precise management decisions next season. Hull rot remains one of the more frustrating and yield-limiting diseases in California almonds, particularly because its full impact is not always visible in the year it occurs. The research is helping clarify where growers should focus their efforts, especially as the disease complex evolves and growing conditions continue to favor new pathogens.

    Mohammad Yaghmour, orchard systems advisor in Kern County, has been closely tracking changes in the organisms responsible for hull rot. While the disease has long been associated with Rhizopus stolonifer and Monilinia species, the increasing presence of Aspergillus niger is shifting both how the disease develops and how it needs to be managed in the orchard.

    Hull rot follows a classic disease triangle, requiring a susceptible host, a pathogen, and the right environmental conditions. What makes this disease particularly challenging is that all three components are often present at hull split, when almonds are physiologically vulnerable and environmental conditions can favor fungal growth. Infection begins in the hull, but the most damaging effects appear later as the fungus moves into the fruiting wood. Leaves surrounding infected nuts dry rapidly, and the spurs that would produce next year’s crop are killed. In severe cases, entire shoots can be lost.

    This delayed impact is critical. Yield losses are not just tied to visible infection but to the loss of next year’s bearing wood. Research conducted across multiple orchards showed that yield reductions become meaningful once strike levels reach roughly one hundred per tree. At that point, the cumulative loss of spurs begins to reduce the productive capacity of the tree in the following season.

    One of the most important takeaways from this work is that not all hull rot is the same. Each pathogen behaves differently and requires different management timing. Monilinia, which also causes brown rot during bloom, infects earlier and must be managed weeks before hull split. In contrast, both Rhizopus and Aspergillusare primarily driven by inoculum originating in the soil, and infections occur at or shortly after hull split.

    The rise of Aspergillus niger is particularly important for growers in warmer production areas. This pathogen thrives under higher temperatures and has become increasingly common in Kern County before spreading more broadly across the Central Valley. Its symptoms differ subtly from those of Rhizopus. Instead of the gray, fuzzy growth commonly associated with Rhizopus, Aspergillus produces darker, flatter, jet-black spores. It can also lead to internal damage, including black streaking in wood due to toxin production, which contributes to spur and shoot death.

    Understanding when infection occurs has helped refine management recommendations. Research shows that almonds are most susceptible during early hull opening, particularly when the split is still narrow. That window—when the hull has just begun to open—is where infection severity is often highest for Aspergillus. This underscores why spray timing is so critical. Missing that narrow window can significantly reduce the effectiveness of control measures.

    Variety also plays a role. Nonpareil, Butte, and Sonora have shown higher susceptibility, while Monterey and Fritz tend to be less affected under similar conditions. In mixed plantings, this means growers should expect greater risk in Nonpareil blocks and manage accordingly, prioritizing inputs where the return on protection is highest.

    Cultural practices continue to play an essential role in reducing disease pressure. Excess nitrogen has been shown to increase susceptibility, likely by promoting lush growth that favors infection. Careful nitrogen management can reduce that risk. You can learn more about nitrogen management at Almonds.org/NutrientManagement. Similarly, irrigation practices influence disease development. Strategic deficit irrigation has been linked to reduced incidence of Rhizopus, while excessive soil moisture during hull split can increase disease pressure.

    Dust management is another overlooked but important factor. Because Aspergillus and Rhizopus originate in the soil, any activity that creates dust can move spores into the canopy. Equipment traffic during hull split can unintentionally increase inoculum pressure at the exact time tissues are most vulnerable. Reducing dust during this period can help limit infection.

    Fungicides remain a valuable tool, but they are not a standalone solution. Their effectiveness depends heavily on correct timing and proper pathogen identification. Materials in several FRAC groups have shown strong performance when applied at the early stages of hull split. However, applying them too early or too late significantly reduces their value. In most cases, hull split sprays for disease management can be aligned with navel orangeworm treatments, helping to streamline operations.

    For growers, the message is clear: while the opportunity for in-season treatment may have passed, hull rot management is less about any single treatment and more about matching the right tool to the right moment. By using this season’s observations to scout for disease pressure, identify the pathogen involved and plan ahead for precise spray timing, balanced nitrogen, careful irrigation and dust reduction, growers can better protect the fruiting wood that supports next year’s crop and build more resilient orchard systems over time. — Story contributed by the Almond Board of California

  • California Growers Have a New Enemy That’s Spreading Fast

    Golden Mussels have been a silent threat California growers since they arrived in the Delta in 2024. These mollusks reproduce at an alarming rate and don’t require saltwater, meaning they are now clogging up irrigation systems and depriving crops of an already scarce water supply. Jason McKee from Greenleaf Ag spoke with Matthew Malcolm from Malcolm Media Ag Publishing to discuss this latest threat to orchards. Watch this quick video and learn more in Pacific Nut Producer Magazine.