Fungicide Sprays and Spider Mites Peanut Notes No. 207 2022
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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.