The map of soybean growth stages shows clearly contrasts areas of the state that were planted in a timely manner due to fit soil conditions (northwest) from areas of the state where planting was delayed due to wet fields (everywhere else, Figure 1).
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| Figure 1. Soybean growth stages up to August 9, 2019. Map: NDSU Extension IPM. |
The percentage of plants infested with soybean aphids remained below 25 percent throughout northwest counties with the exception of a single field on the Norman County, MN North Dakota border (Figure 2). Aphid incidence was higher at several locations in the southeast and one field in west central Minnesota.
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| Figure 2. Soybean aphid incidence (percentage of infested plants) through August 9, 2019. Map: NDSU Extension IPM. |
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Aphid densities remained fewer than 21 aphids per plant at all but one location in the southeast (Figure 3).
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| Figure 3. Number of soybean aphids per plant through August 9, 2019. Map: NDSU Extension IPM. |
Continue to scout soybean fields to ensure that soybean aphids do not near action thresholds before pods are filled. For tips about best practices and to learn more about treatment thresholds visit the UMN Extension
soybean aphid webpage.
