Don’t Forget About Stink Bugs in Cotton
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Collapse ▲Following the reduced-spray environment brought by Bt cotton, stink bugs became a consistent pest. These were a major concern for growers and still are, outside of areas that knock them out with treatments for tarnished plant bug.
Growers who have followed our regional insecticide recommendations for tarnished plant bug should not have sprayed a broad-spectrum insecticide yet, outside a possible early-season thrips spray. It’s time for growers to think about stink bugs that must be controlled with a broad-spectrum insecticide (primarily acephate, Bidrin, or a pyrethroid). Keep in mind that the plant will have the most stink-bug susceptible bolls will be on the plant in the 3, 4, and 5th week of bloom. Our stink bug thresholds are rigorous and are a good guide to knowing when to make an economic insecticide application for these pests.
It’s good to identify what species are present for proper insecticide selection (described below). However, treatment decisions should be made on the presence of internal boll injury and not the presence of insects. Note that plant bugs can also injure small bolls and the internal injury is indistinguishable from stink bugs. Count any stained lint or warty growths as stink bug injury. Simple punctures without warts should not be counted.