Bruce Potter, IPM specialist
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Figure 1. Distribution of the soybean gall midge as of August 18, 2021. Source: https://soybeangallmidge.org/. |
These new county infestations were not at high SGM population densities. For most of these MN detects, dead or wilted plants (Figure 2) did not provide clues. We needed to look beneath normal-appearing canopies for symptoms at the base of stems (Figure 3). In some cases, brittle stems made finding the larvae easier but even then, only a few infested plants were typically found in these fields. For example, a sharp-eyed farmer in Traverse County found soybean gall midge by inspecting a single plant with a broken stem in one of his fields this week.
We have also observed SGM in Minnesota on the alternate host sweet clover. It has not yet been found on dry beans in commercial fields or infesting greenhouse grown dry bean cultivars plants placed in SGM infested fields.
At this time, we are still capturing emerging soybean gall midge adults, so soybean death and stem breakage is likely to continue over the next several weeks. If you observe soybean gall midge, particularly in a Minnesota county where it has not yet been confirmed, please contact bpotter@umn.edu or koch0125@umn.edu. Infestations can often be confirmed with a photo and field location.
Updated distribution maps, gall midge adult emergence and other information is available at: https://soybeangallmidge.org/.
Checkoff dollars through the North Central Soybean Research Program and Minnesota Soybean Research and Promotion Council have helped support these survey activities.
Updated distribution maps, gall midge adult emergence and other information is available at: https://soybeangallmidge.org/.
Checkoff dollars through the North Central Soybean Research Program and Minnesota Soybean Research and Promotion Council have helped support these survey activities.
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