Northwestern Wisconsin counties were recently impacted by soybean tentiform leafminer. Soybean tentiform leafminer was confirmed for the first time on cultivated soybean in Wisconsin by the Wisconsin Department of Agriculture, Trade and Consumer Protection. It was initially detected in St. Croix County Aug. 21 and subsequently found in Polk and Pierce counties Aug. 25, bringing the total to three confirmed counties in northwestern Wisconsin. Infestations in all fields were light and did not warrant treatment.
First confirmed case of pest in soybeans
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Soybean tentiform leafminer larva is shown.
Soybean tentiform leafminer has been documented in St. Croix, Pierce and Polk counties as of Aug. 25, 2026.
Soybean tentiform leafminer moth size is compared to a quarter.
Scout for mines on the underside of soybean leaves.
Scout for speckled areas on upper side of leaf opposite of mines.
Soybean defoliation thresholds in Wisconsin are displayed for reference.
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