California Ag Network

Tag: Kemin Crop Technologies

  • Kemin introduces RevoCURB™, a new safe and versatile soil treatment tool to address agricultural issues such as restrictions on fumigants and the requirements for buffer zones.

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    Fumigants are a cornerstone of conventional agriculture in the United States for combating soil-borne pests and diseases. However, fumigants also have significant limitations, including application requirements, buffer zone restrictions and the lack of available products for organic farmers.

    The role of fumigants in agriculture

    Fumigants are chemical agents applied before planting to eliminate pests, pathogens, and weeds, which protect crops and improve vigor and yields, especially in high-value crops like strawberries and tomatoes. Despite their effectiveness, most carry significant health and environmental risks, leading to strict regulations on their use, application timing, permitting, and buffer zones1,2. In some cases, these health concerns have led to complete bans on specific products, such as methyl bromide, which has been restricted in both the United States and Europe2,3.

    Buffer zone restrictions

    To reduce exposure risks, the Environmental Protection Agency (EPA) enforces strict buffer zones, areas where fumigant application is prohibited, near public spaces like schools and hospitals. Zone size depends on the fumigant used, application method, local environmental conditions, and distance to public spaces. While crucial for public safety and conservation efforts, buffer zones decrease usable farmland. Often, untreated buffer zones can lead to uneven pest control and reduced crop yields4. Buffer zones also add regulatory burdens, including signage and detailed management plans, increasing cost and complexity2.

    Additional limitations of fumigants

    Beyond buffer zone requirements, fumigants come with additional key limitations:

    • Cost: Fumigation is expensive, requiring investments in chemicals, labor, and regulatory compliance, which are often unaffordable for small-scale farmers.
    • Equipment: The application requires specialized equipment, including shank injectors, calibrated applicators, tarping systems, and enhanced personal protective equipment, which further increases total expenses.
    • Application Conditions: Efficacy depends on precise environmental conditions (soil temperature, soil moisture, weather) and properly calibrated equipment to ensure efficacy
    • Environmental Risks: Fumigants are highly volatile and can drift off-site, endangering nearby communities and ecosystems. Improper application may lead to water contamination or harm to non-target organisms.

    Organic alternatives to fumigants

    For organic farmers, the limitations of fumigants are even more pronounced, as organic certification prohibits the use of most synthetic fumigants. In response to these challenges, organic farmers rely on natural alternatives to manage soil-borne pests and diseases5:

    • Soil Solarization: Fallow fields are covered with plastic during peak heat for 4-8 weeks to trap solar energy, which can kill pathogens, pests, and weed seeds. This timeline may be challenging as the temperatures required for effective treatment coincide with peak growing seasons.
    • Anaerobic Soil Disinfestation (ASD)6: Organic materials like rice bran or mustard seed meal are incorporated into the soil and the soil is then saturated with water and covered with plastic to create anaerobic conditions. As oxygen is depleted, aerobic pests die and anaerobic species flourish, producing byproducts that further suppress pathogens. Once the field is cleared and prepared for planting, the reintroduction of oxygen into the soil then reduces anaerobic microbial populations, resulting in a cleaner overall soil. This process, however, can be quite expensive as it is water- and input-intensive and can be ineffective if fields are drained too early.
    • Crop Rotation and Cover Cropping: These practices disrupt pest life cycles and improve soil health; however, they are inadequate to knock down heavy infestations without additional inputs.
    • Biological Controls: Beneficial species help suppress pests via predation or competition. Their success depends on careful species selection, application timing, and environmental fit, and they work best when paired with other methods of control.

    Introducing RevoCURB™, a safe-to-use, 3-in-1 solution for organic and conventional growers.

    RevoCURB™ is a new OMRI-listed, 3-in-1 soil treatment designed to enhance crop health and yield by targeting plant parasitic nematodes, microbes, and pre-emergent weed seeds. Exempt under FIFRA 25(b), RevoCURB offers a 0-hour restricted entry interval (REI), no restrictions on maximum residue levels, minimal requirements for personal protective equipment, and no need for buffer zones. RevoCURB utilizes the power of Smart Blend Technology and four essential oils – thyme, clove, garlic, and cinnamon to provide control through multiple complementary modes of action. These oils disrupt cellular membranes on contact, inhibit nematode egg hatching, impact the nervous systems of juvenile nematodes present in the soil, causing paralysis and death, vaporize within the soil column, repelling pests and delaying repopulation and suppress weed seed germination.

    “These contact and repellency modes of action work in tandem upon application of RevoCURB to disrupt pest lifecycles and prepare soils for planting.” – Emma Trainer, Scientist at Kemin Crop Technologies.

    RevoCURB should be applied 14 days prior to planting or post-harvest and watered in per label directions to maximize efficacy and the zone of protection without harming crop seeds, seedlings, and plugs.

    Field trial to assess the effectiveness of RevoCURB on root-knot and stunt nematode populations on cucumber. San Luis Obispo, California (Credit: Bradley Booker at Pacific Ag Research) (SD-25-28093)

    RevoCURB protects young crops from multiple soil pest pressures, allowing for healthier plants and greater yields. Because it’s free from buffer zone requirements, REI, and residue restrictions, RevoCURB is ideal for transitional areas and organic acreages – bringing flexibility and safety where conventional fumigants fall short.

    For more information about RevoCURB, visit www.kemin.com/revocurb or contact us croptech@kemin.com

    References

    1. Panth, M. & Hassler, S. and F. Baysal Gurel (2020). Methods for Management of Soil-borne Diseases in Crop Production. Agriculture,
    2. United States Environmental Protection Agency. Soil Fumigant Toolbox. https://www.epa.gov/soil-fumigants
    3. European Commission. European Community Management Strategy for the phase-our of the critical uses of methyl bromide. April 2009. https://ozone.unep.org/sites/default/files/additional-reported-information/MeBr_Submissions/EC%20Management%20Strategy%20for%20Methyl%20Bromide.pdf
    4. Vansickle, J.J.; Smith, S.; and R. Weldon (2009). Impacts of EPA proposed buffer-zone restrictions on profitability of Florida strawberry growers. University of Florida Institute of Food and Agricultural Sciences; FE795.
    5. Bolda, M.P.; Dara, D.K.; Daugovish, O.; Koike, S.T.; Ploeg A.T.; Brown, G.T.; Fennimore, S.A.; Gordon, T.R.; Joseph, S.V.; Westerdahl, B.B.; and F.G. Zalom. Non-fumigant alternatives for soil disinfection. UC IPM Pest Management Guidelines: Strawberry. UC ANR Publication 3468. University of California Agriculture and Natural Resources, Davis, CA. https://ipm.ucanr.edu/agriculture/strawberry/non-fumigant-alternatives-for-soil-disinfestation/#gsc.tab=0
    6. Lopes, E.A.; Canedo, E.J.; Gomes, V.A.; Vieira, B.S.; Parreira, D.F.; and W.S. Neves (2022). Anaerobic soil disinfection for the management of soil-borne pathogens: a review. Applied Soil Ecology, 174.

    © Kemin Industries, Inc. and its group of companies 2025. All rights reserved. ® ™ Trademarks of Kemin Industries, Inc., USA. Always read and follow label directions. FIFRA 25(b) Exempt: RevoCURB has not been registered by the United States Environmental Protection Agency. Kemin Industries, Inc. represents that this product qualifies for exemption from registration under the Federal Insecticide, Fungicide, and Rodenticide Act. The products are not registered or authorized for sale in all states. Consult with your Kemin representative or state regulatory representative for approval of this use in your state, specific applications, and labeling. croptech@kemin.com | 800-752-2864 (ext.2).

  • Asian Citrus Psyllid Infestation in California: A Guide for California Citrus Growers

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    California’s vibrant citrus industry, renowned for its oranges, lemons, and limes, is under threat from the Asian citrus psyllid (Diaphorina citri , ACP). This small invasive pest not only jeopardizes the health of citrus trees but also acts as a carrier of Huanglongbing (HLB), a bacterial disease that causes citrus greening. Here’s what growers need to know about ACP, its impact, and how Kemin Crop Technologies can help with effective botanical solutions to manage and prevent infestations.

    Understanding the Asian Citrus Psyllid

    The Asian citrus psyllid is a sap-sucking insect native to Asia, Africa, and the Saudi Arabian Peninsula. It was first detected in the United States in 2005 in Florida and in California in 2008 and has continued to spread across the major citrus growing regions. This insect’s feeding behavior damages citrus trees by causing leaves to curl and blacken. However, the real threat lies in ACP’s role as a vector for Huanglongbing (HLB). HLB is one of the most devastating diseases affecting citrus crops worldwide. HLB is caused by the bacteria Candidatus Liberibacter asiaticus, which infects the phloem of citrus trees, disrupting nutrient flow. Once a tree is infected, there is no cure, and the disease eventually leads to the tree’s death. Infected trees can be stunted, have reduced fruit yield, blotchy mottled leaves, and produce misshapen, bitter fruit, rendering them unmarketable. The economic and ecological impact of ACP and HLB is profound, putting California’s multibillion-dollar citrus industry at significant risk.

    Identifying an ACP Infestation

    Early detection of ACP infestations is crucial for effective management. Growers should regularly inspect their orchards for the following:

    • Adult Psyllids: Small (3-4 mm long), brown, winged insects perched at a 45-degree angle on leaves.
    • Nymphs: Tiny (0.25-2 mm long), yellowish-orange immature psyllids found on new growth.
    • Honeydew: Sticky substance excreted by psyllids, often leading to sooty mold development.
    • Leaf Curling: Deformed leaves caused by psyllid feeding.

    Regular monitoring and application during ACP’s active growth stages can significantly reduce infestations and aid in limiting the spread of HLB through psyllid vectors.

    Unlock Superior Protection with TetraCURB™ MAX: Kemin’s botanical-oil based Solution

    For growers seeking a sustainable and effective solution, Kemin’s botanical oil-based biopesticide, TetraCURB MAX, offers a promising option. TetraCURB MAX is a rosemary, peppermint, clove and castor oil-based contact miticide-insecticide and repellent specifically designed to target soft-bodied insects like ACP. Its unique composition is formulated from a proprietary blend of essential oils and synergizers to have multiple modes of action that paralyze, suffocate, desiccate, repel, and disrupt the pest’s feeding and reproductive cycles.

    Here are the key benefits of TetraCURB MAX, and excellent tool for citrus growers to leverage:

    • Smart Blend for Maximum Impact: TetraCURB MAX is formulated with a proprietary blend of active ingredients, including castor oil, rosemary oil, clove oil, and peppermint oil. It also contains an adjuvant, soap and emulsifiers ensuring optimal spray contact, spread, and improves active ingredients efficacy without phytotoxicity. This unique combination ensures multiple modes of action, such as neurotoxic effects, contact suffocation, desiccation, and repellency aiding in fast pest knockdown. The multiple modes of action also help to reduce the likelihood of pests developing resistance.
    • Broad-Spectrum: TetraCURB MAX is effective against a range of pests, being specially formulated to target small, soft-bodied insects. ACP fits perfectly into this category, and we see excellent ACP knockdown in 3rd party assays.
    • TetraCURB MAX Kills on contact with a quick knockdown thanks to the smart blend technology.
    • Safety for Labor, Workers, and Consumers: TetraCURB MAX is made from safe-to-use ingredients, providing peace of mind for laborers and workers. Use of TetraCURB MAX requires minimal personal protective equipment (PPE) and allows a zero-hour restricted-entry interval (REI)
    • Minimal Disruption to Harvest Activities: With a zero-day pre-harvest interval (PHI) TetraCURB MAX can be applied at any time during the season, including on the day of harvest.
    • Versatility: TetraCURB MAX is labeled for use on all crops and has no restrictions on the number of applications per growing cycle.
    • Environmental Safety: TetraCURB MAX does not cause phytotoxicity in plants when used according to the label direction.
    • Easy Application: Applying TetraCURB MAX is simple. It can be used as a stand-alone or in a tank mix. Shake well before use, dilute in water, and apply as a foliar spray with standard equipment ensuring full plant coverage until runoff. ​ With a recommended spray volume of 100 gallons per acre and a treatment interval of 5-10 days, TetraCURB MAX fits seamlessly into your crop protection routine.
    • Exemption from Food Tolerance Requirements: These biopesticides are exempt from Maximum Residue Limits (MRLs) in the United States, as the pesticide residue expected to remain on crops after application is minimal.

    Proven Efficacy in Lab and Field Trials

    Recent studies conducted at the University of Florida and in Oviedo, Florida have demonstrated the efficacy of TetraCURB MAX against ACP. First, in lab bioassays, TetraCURB MAX at a 1% rate achieved a 59% mortality rate of ACP nymphs within just three days of the application, outperforming the positive control Spinosad-based product. ​A field trial on sweet orange trees showed that two applications of TetraCURB MAX at 0.5% 21 days apart, significantly reduced the nymphal population by 86%, matching the performance of conventional insecticides like Cyazypyr at 16 fl.oz/100 gal. ​ Download the crop sheet to see the full data set HERE:

    Protecting California’s Citrus Legacy

    The battle against ACP and HLB is ongoing, but with vigilance and innovative solutions like TetraCURB MAX, California’s citrus growers can protect their orchards and ensure the industry’s longevity. By adopting sustainable practices, we can safeguard the future of citrus farming for generations to come.

    Don’t let ACP infestations compromise your citrus yield. ​Add TetraCURB™ MAX to your rotation in an IPM program and experience the benefits of superior pest control. ​

    For more information, visit kemin.com/tetracurbmax or contact your Kemin Sales representative today.