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University of Minnesota Extension

Managing spider mite on soybean

Twospotted spider mites
Figure 1. Twospotted spider mites adults and eggs. Photo: David Cappaert, Michigan State University, Bugwood.org

Prolonged drought raises the threat of two-spotted spider mite (Tetranychus urticae) outbreaks in soybeans and corn. When the drought intensifies in Minnesota, infestations can reach economic threshold levels.

Here, you’ll find strategies for managing spider mite outbreaks, including how to scout for them, when to treat and which miticides may be effective.

Spider mite outbreaks are rare, but have occurred more frequently in recent years—including in 1988, 2007, 2009 and 2010. To make matters worse, you’ll need to make tough decisions if you’re trying to manage both spider mites and soybean aphids.

About spider mites and the damage they cause


How to scout for and spray spider mites


Bruce Potter, Extension integrated pest management specialist, Southwest Research and Outreach Center, and Ken Ostlie, emeritus Extension entomologist

Reviewed in 2022

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