My Farmer's Almanac predicts that July and August in Iowa will be cooler than normal, with the hottest temperatures in late June and mid-August, and with rainfall near normal. But as my grandfather would say, "I don't put much stock in the Almanac," meaning that a lot of things can change between now and then. If the prediction is true and temperatures are cooler than normal, then spider mites would not be expected to be a problem in soybeans.
Iowa State University
Rice, Marlin E., "If July and August are hot and dry, expect spider mites" (2007). Integrated Crop Management News. 1126.
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