Alternatives to Lorsban for Rootworms Peanut Notes No. 121 2022

— Written By
en 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.

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 ▲

I was asked what alternatives to Lorsban do we have for rootworm control in peanuts. Here is my answer to that text.

There is currently no chemical option for rootworms in absence of Lorsban. Rick Brandenburg and Brian Royals are looking at insecticides to control the adults but we do not have data that shows this is an effective approach. There is no good way to predict when the vast majority of adults will enter the field and that would require multiple applications (of insecticide), possibly 3 giving six weeks of protection. But this could cause mites to flare, especially with this year with dry conditions (which means the risk of rootworms is lower with our drought conditions.) This depends on the insecticide, and Steward is one being pushed and it is gentle on beneficial organisms and would likely not flare mites. But is costs $45 for 3 sprays with no promise of control. A pyrethroid would really flare mites. We are not recommending this approach until we have data. The fear is that chasing the adults could be expensive and ineffective.

Generally, we think that about 25% of our acres have risk (to rootworms,) but maybe only 5-10% are at risk for levels of damage that are measurable in terms of yield. And then less than 5% are at risk for major yield loss. But it is hard to know what fields will be hot hard. Under current rainfall patterns, risk is low across much of the state and risk is high for mites across much of the state.

Wish we had a sure chemical option but we don’t. We will know more about the foliar sprays for next year. Take a look at the SCRW risk index. Many of our fields are at low to moderate risk. And many folks have had fields with these risk levels and have not been treating with Lorsban and have not experienced significant damage.