Earworms, in North Carolina, rarely defoliate plants to high levels like those in the Midsouth defoliation studies (more likely for armyworms or loopers). They also prove to me that it is nearly impossible for defoliation to nickel and dime us throughout the season. These studies prove to me that our threshold of 30% defoliation is very very conservative. Incremental defoliation did not have an effect if soybeans were defoliated multiple times at 17.5% and 33% defoliation, but had a small effect if soybeans were defoliated multiple times at 66% defoliation. Yield loss started somewhere after 66% defoliation at V6 in these studies. These thresholds were recently re-evaluated in the Midsouth. Here is a good guide to estimating soybean leaf defoliation. Treating prior to bloom: Our official defoliation threshold is 30% defoliation throughout the canopy until bloom or two weeks prior to bloom (depending on how the crop looks) and 15% defoliation after bloom. Earworm management is critical once there are pods on the plant. Our online threshold calculator for corn earworm in podding beans can be found by visiting the Soybeans portal, clicking on Insect Management, then Thresholds, and scrolling down to the online corn earworm in soybean t hreshold calculator link. Therefore growers should use Blackhawk, Intrepid Edge, or Steward to control corn earworms in soybeans. If Besiege or Prevathon is sprayed for earworm, by the time loopers show up, there are still small amounts of this insecticide left in the plant this scenario will likely increase levels of resistance in soybean looper populations. In addition, soybean looper is resistant to this insecticide and generally shows up in the biggest numbers a few weeks after earworms. Because we are entirely reliant on this insecticide to control corn earworm (bollworm) in Bollgard II, WideStrike, and TwinLink cotton, I am encouraging growers to avoid this insecticide in soybeans to preserve it in cotton. One of these is the insecticide chlorantraniliprole, which an active ingredient in Prevathon and Besiege. We have a number of effective insecticides for corn earworm in North Carolina soybeans. Please note that some applications and/or services may not function as expected when translated. NC State Extension does not guarantee the accuracy of the translated text. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. To the extent there is any conflict between the English text and the translation, English controls.Ĭlicking on the translation link activates a free translation service to convert the page to Spanish. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.Įnglish is the controlling language of this page. NC State Extension no garantiza la exactitud del texto traducido. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.Īl hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. NC State Plant Disease & Insect Clinic Įl inglés es el idioma de control de esta página. ![]() ![]() Crop Comparison Tool (Excel Spreadsheet).Weed Management (From Soybean Production Guide).Thresholds (including online calculators).Insect Management (From Soybean Production Guide).Disease and Nematode Management (From Soybean Production Guide).Managing Cereal Rye for Benefits in Cotton and Soybeans.Additional Production Information chevron_right.Calculators & Decision Aids chevron_right.Soybean On-Farm Trialing (OFT) Program.
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