Fleming McMaster, local crop consultant, reported threshold numbers of redbanded stink bug (RBSB) in soybeans that were “just sprayed” with a pyrethroid, confirming that this species is tolerant to most insecticides we use in soybeans.
Very high rates of acephate, some pyrethroids and selected mixes are used for acceptable RBSB control in the Midsouth and Gulf Coast states where this species can be a major pest of the crop.
I am still seeing plenty of moth activity in soybeans. There are many velvetbean caterpillar moths flying around, and there are plenty of green cloverworms, small soybean loopers, and stink bugs still out there in soybeans. So, concentrate scouting efforts on soybeans at this point in the season.
Jay Crouch, county agent in Newberry, SC, reported that he is “seeing huge levels of fungus (pictured at right) in kudzu bugs.”
Late populations of stink bugs are basically all that remain in cotton as a potential concern – at least for 6-legged animals. Adult stink bugs have likely stopped depositing egg masses in cotton and have shifted reproduction to soybeans.
However, remember that any immature stink bugs still present in cotton cannot fly and cannot leave the field. They are committed to feeding and becoming adults. Give those late fields one last look.
Bollworm is likely out of the picture in most fields, and spider mites have not been bad generally. Hopefully, hurricane Irma takes a right turn out to sea. If not, we could see much of our cotton end up on the ground after a good growing season. Everyone, face east and blow hard!
Soybean loopers, green cloverworms, velvetbean caterpillars, other caterpillar species, and stink bugs are our main concerns to end the insect season in soybeans. There are stink bugs and selected species of caterpillars in just about any given field. It all depends on the spray history of each field – what was sprayed last and how many days ago was it applied
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If a pyrethroid (at a high rate) was used very recently in a field, you will most likely be dealing with soybean looper, brown stink bug and redbanded stink bug, if there are any issues at all.
Keep up the weekly scouting and be under threshold for insects into R7 to be sure. If a field has been sprayed recently with a selective spray for caterpillars only, you could be needing a final spray for stink bugs. Again, you have to go check to be sure. Go scout