The weather in Iowa over the next several weeks will determine whether spider mites escalate to damaging levels or not. If the temperatures are cooler than normal, then spider mites would not be expected to be a problem in soybeans; however, there are a few reports of spider mites in eastern Iowa where soil moisture is adequate, and in one field, spider mites are being found under irrigation. Normally, it is the hotter than normal temperatures in late July and August, coupled with a soil moisture deficit, that stresses the plants and creates good conditions for spider mites.
Iowa State University
Rice, Marlin E., "A few spider mites in soybeans" (2007). Integrated Crop Management News. 996.
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