Do’s and Don’ts for Treating Soybean Insects in August and September

— Written By
en Español / em Português
Español

El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.

Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. 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. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.


Português

Inglês é o idioma de controle desta página. Na medida que haja algum conflito entre o texto original em Inglês e a tradução, o Inglês prevalece.

Ao clicar no link de tradução, um serviço gratuito de tradução será ativado para converter a página para o Português. Como em qualquer tradução pela internet, a conversão não é sensivel ao contexto e pode não ocorrer a tradução para o significado orginal. O serviço de Extensão da Carolina do Norte (NC State Extension) não garante a exatidão do texto traduzido. Por favor, observe que algumas funções ou serviços podem não funcionar como esperado após a tradução.


English

English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.

Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.

Collapse ▲

Do: Scout your crop. Identification is the first step so you know what you’re dealing with. The second step is counting what you have. Using these two things, you can apply Extension-recommended thresholds and save money. Use a sweep net for beans in 30 inch rows or less and a drop cloth for wide-row beans.

Do: Assess your growth stage and canopy. Thresholds are set for the average situation. Your beans are not average! We can relax thresholds, depending on the pest, as beans become more mature. A full canopy can tolerate much more defoliation than the thresholds that are set. It’s important to adjust thresholds for each unique situation.

Do: Choose the correct insecticide. Don’t be tempted to add something in the tank for pests that are below threshold. If you so, you might cause problems for yourself later on in the season (see the don’t section!). For earworms, choose Blackhawk, Intrepid Edge, or Steward (see previous article for reasons not to use Besiege or Prevathon for earworm). If you have stink bugs above threshold, choose a pyrethroid. Note that pyrethroids sprayed now will open you up to armyworms, bean leaf beetle, and loopers. So only use them if you need to.

Don’t: Spray pests that are below threshold levels. ALL of our thresholds are conservative. That is to say, we tell growers to spray before they experience an economic loss to provide some buffer. Furthermore, many growers may be tempted to add something broad-spectrum in the tank (pyrethroids (bifenthin, for example) or Orthene) to clean up the field. Doing so will clean up the field, including beneficial insects. See this article from last year, where we sprayed loopers with Prevathon and bifenthrin. Two weeks after treatment, looper numbers were actually higher in all plots where we used bifenthin! Remember the old adage…no such thing as a free lunch.

Don’t: Spray just because your neighbor did so or just because you found pests in a single field. Soybean pest pressure is extremely variable in each field due to differences in planting date and varieties. 2019 has been especially problematic since pest pressure has been so spotty. Treat each field as a unique situation.