| Reduced Risk Status: |
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| IPM Compatibility: |
Per Requester: Good Fit; It provides a different mode of action than commonly used postemergence grass herbicides. It helps manage and delay herbicide resistance, particularly in Italian ryegrass. It is typically used as part of an integrated program that includes cultivation, mulches, hand weeding, sanitation, and crop rotation where applicable. Effective grass control can reduce the need for repeated mechanical operations and hand labor:06/26;
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| Reasons for need: |
Italian ryegrass (Lolium perenne ssp. multiflorum) Perennial ryegrass (Lolium perenne) Quackgrass (Elymus repens) Tall fescue (Festuca arundinacea); primary pest is Italian ryegrass; Italian ryegrass & other grass weeds are increasingly problematic in perennial strawberry production. These weeds compete with the crop, interfere with harvest, & increase production costs. Would provide an important addl moa for grass control & herbicide resistance mgmt; tech currently used are clethodim, glyphosate, mowing, cultivation between rows - all have limited efficacy:06/26; MD:add'l moa for grass control in areas where resistant Italian ryegrass is present, or before resistant-ryegrass becomes a problem:08/26; OR:Issue managing grass weeds in row middles:08/26; MA:need add'l options to control grasses, especially perennial grasses, in perennial strawberries. Grasses can quickly become resistant to clethodim if not properly rotated & growers are hesitant to use glyphosate due to the risk of crop damage:08/26; DE:Fall herbicide apps have become an important component of season-long weed control as we experience warmer winters. The warmer winters allow for winter annuals to emerge throughout our milder winters & result in larger plants (more difficult to control plants) in early March:09/26; NY:reducing resistance risk, crop competition, and reliance on labor-intensive control:09/26; NJ:quackgrass & tall fescue control that is not achieved with other graminicides; better crop safety than glyphosate application; more cost eff than mowing or cultivation for perennial grass control:09/26;
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| Requesting State(s): |
DE:VanGessel, M ; MA:Gannett, M ; MD:Vollmer, K ; NJ:Besancon, T ; NY:Sosnoskie, L ; OR:Moretti, M*, Rendon, D ;
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| PCR Use Pattern: |
Apply Kerb SC to established strawberry plantings from late September to early November after harvest when soil temperatures are cool but above freezing. Apply to moist soil or prior to rainfall/irrigation for optimum activity. Apply at 2.8 L/ha only once per year in pre-emergence, 120 PHI. Do not apply to frozen soils. Best performance is obtained under cool soil conditions and adequate soil moisture following application
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| EPA Default Residue Trials: |
1 2 3 5 10-3 12
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| IR-4 Residue Trial Plan: |
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| Residue Protocol Use Pattern: |
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| Efficacy/Crop Safety (E/CS) Data Required: |
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| E/CS Research Comments: |
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| Label Use Pattern Submitted To EPA: |
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| EPA PIF Status: |
Yellow:08/26;
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| EPA Status: |
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| EPA PRIA Date: |
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| MRID: |
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| Comments: |
Also ref to PR# 00387, but very old and lacks critical info; new request specifically mentions "perennial" strawberries; EPA Caution:08/26/sb; Corteva supports as Potential: ECS before Residue:09/26/sb;
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| International Status: |
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| QA Archive: |
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