Fungicide Sprays and Spider Mites Peanut Notes No. 207 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 ▲

We have a significant number of fields with mites that are at least 2 weeks away from digging. We still have risk from leaf spot (even though rain is limited, humidity is still high in some cases and that could foster leaf spot.) This is where a good look at the leaf spot advisory can help. Chlorothalonil is often considered the fungicide most likely to flare mites. But others can as well. We rely heavily on chlorothalonil for the final spray and for resistance management.

I would let the leaf spot advisory help me make this decision. If you are not on the list serve from Barbara, let me know and I will try to get you there. The advisory is posted each day and you can get the information by e-mail. I have attached the e-mail from earlier today (September 9.) Pay particular attention to the LESD (last effective spray date.) The LESD is August 25-26 at the North Carolina sites and August 19 at Suffolk. If you have sprayed since that date you are protected from leaf spot. For NC, that was about 14 days ago. At Suffolk, it was about 20 days ago. If you DO NOT have mites building, the final chlorothalonil spray can be applied with little risk and will protect peanuts from leaf spot and serve as a good resistance management tool. The above suggestion, to look at the advisory and apply only if leaf spot risk increases (based on the LESD and when you applied your last fungicide), is based on presence of mites. If you don’t need to spray based on the advisory, don’t spray as it could increase mites even further. Also, look at the canopy. If you do not have any lesions in the lower areas and it remains dry (or even if there is some weather that promotes leaf spot,) on September 9 with no lesions caused by leaf spot is a pretty good place to be.

Leaf Spot Advisory September 9