Spider Mites in Martin County Peanut Notes No. 215 2023

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Found spider mites in a grower’s field. Pod maturity is 7 to 10 days away from digging. Should he spray for mites?


Rick, any value in spraying if peanuts are 10 days out from digging? Depends some on whether it is the whole field or just smaller areas. Will need to check PHI. You are about 17 days out from combining.


Difficult call without knowing the extent of the infestation. I only have my phone and off the top of my head, I do not remember the PHI, but obviously, that is important as well. If they are webbing, the leaf shed is probably going to occur even with a spray.


They are not webbing.


Portal has PHI of 1 day. All other products are 14 days. I think Rick’s work has shown that Portal is the most effective product. From the image with respect to infestation, lack of webbing, and from the time to maturity of peanut, it seems like there would be no advantage of spraying.

Only caveat is peanuts my not advance much in 10 days with respect to maturity based on our weather and that would give mite populations time to build (if they are really 20 days out from maturity). Suppression of mites might help if weather stays like it is and peanuts just sit there.

Tough call. Could be second-guessing the decision after harvest but spraying might help farmer feel like all that can be done has been done.


Yes, it is a tough call. If he sprays, he has done all he can. And he will not know if he really saved any of his crop but he knows he did not lose any. However, if he doesn’t spray and the peanuts languish in the field and he starts losing leaves, he is not going to be a happy camper. It is almost one of those flip a coin situations. If he does spray Portal, use the lower labeled rate.


Ok. I had told him earlier today to plan on spraying tomorrow unless I heard differently. Thanks for all help.

Rows of Peanut