![]() ![]() Did you have Cruiser (thiamethoxam) or Poncho (clothianidin) and at what rate (250, 500, 1250)? In-furrow pyrethroid insecticides will definitely help prevent cutworm injury, and it can also beef-up control of other pests not well controlled by the standard seed treatment rates (e.g., sugarcane beetle or heavy wireworm or billbug infestations). Base seed treatments and rates vary by the seed company. The first thing you need to know is what insecticide seed treatment is on your corn. Capture LFR is one option, but other pyrethroid insecticides are labeled for in-furrow application in field corn. This is a common practice for those running pop-up fertilizers, where they include a pyrethroid insecticide with the starter. This has some folks asking if they should apply in-furrow insecticides. ![]() ![]() But seed treatments by themselves will not hold up to serious cutworm infestations. The seed treatments may provide some control of cutworms, particularly Poncho (clothianidin) at the 1250 rate. If you’ve had nothing but dead vegetation present for two or more weeks prior to planting, it is unlikely you will have large cutworms in the field, and the above Bt technologies should hold-up to subsequent infestations of cutworms. There is a rating of how well different BT corn technologies control cutworm in UT’s insect control recommendations for corn. ![]() Examples include Herculex, SmartStax, Optimum TRIsect, Optimum Leptra, and Viptera. Some Bt corn technologies work pretty well at controlling small cutworms. It’s hard to get an early burndown in corn, and I especially recommend this when green vegetation, including cover crops, persisted within the field within two weeks of planting (thus allowing a green bridge for cutworms to survive). However, I often recommend a preventative application of a pyrethroid insecticide within a week of planting, and preferably the day or week following planting. The suggested treatment threshold for cutworms is when 5% or more of plants are damaged or 2 or more larvae are found per 100 plants. I’ve written about this subject before ( ).Īlthough cutworms are not a common problem on most acres, they can sneak up on you. As we approach corn planting time, I’ve had several questions related to cutworm management and/or the use of in-furrow insecticides. ![]()
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