Granular and Liquid Formulations of Chlorpyrifos Peanut Notes No. 46 2024

— Written By
en Español / em Português

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.


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 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 ▲

Years ago, Rick and Ames Herbert reported that liquid Lorsban incorporated in soil at a shallow depth suppressed southern corn rootworm as well as pegging applications. See this article:

Brandenburg, R.L. and D.A. Herbert. 1991. Effect of timing on prophylactic treatments for southern corn rootworm (Coleoptera: Chrysomelidae) in peanut. Journal of Economic Entomology. 80:1894-1898.

Rick and I conducted trials that looked at incorporating Lorsban along with herbicides that are typically used in peanuts immediately prior to planting. We also had other preemergence and postemergence herbicides. The goal, in addition to seeing how effective the application was on southern corn rootworm, was to see if the presence of chlorpyrifos increased herbicide injury. In this study, Lorsban was less effective when incorporated throughout the soil profile than granular Lorsban applied at pegging. This makes sense. In the more recent work, the insecticide was incorporated throughout the soil profile and likely had a less than adequate concentration (and level of uniformity) to suppress southern corn rootworm. See the article below.

Jordan, D.L., R.L. Brandenburg, P.D. Johnson, B.M. Royals, and B. Watson. 2008. Interactions of chlorpyrifos and herbicides applied to peanut (Arachis hypogaea L.). Peanut Science. 35:32-37.

I think the take-home message is that most folks are not going to apply this product on a band (or broadcast) and then lightly incorporate it in the pegging zone (and prevent soil movement of non-treated soil into the pegging zone.) Our data suggest that if you are not going to do it this way (shallow incorporation), do not waste time and money with a traditional preplant incorporated application that we often use for herbicides.


Chlorpyrifos will not be labeled for use in peanuts in any form in 2025. The label change is primarily designed to use up existing stocks of insecticide, especially stocks that are present on farm.