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Soybean Aphids Increasing Slowly (08/02/18)

Based on recent counts from southeastern ND, soybean aphids are slowly starting to increase.

Soybean Aphids Increasing Slowly

Based on recent counts from southeastern ND, soybean aphids are slowly starting to increase. A few fields that were scouted this week in Barnes and Cass Counties, had one or two plants with 100-150 soybean aphids per plant. The remaining plants were all very low, <10 aphids per plant. Therefore, we still have a ways to go to reach the Economic Threshold of an average of 250 aphids per plant with 80% of plants infested, and increasing aphid populations. The soybean crop ranges from R2 (full bloom) through R4 (full pod set) crop stages, so we are getting closer to the R6 (full seed set) crop stage where there is minimum impact on yield from soybean aphid feeding injury.

Continue to scout fields for soybean aphid populations and stay tuned for more reports. Maps are posted weekly on the NDSU IPM website.

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Janet J. Knodel

Extension Entomologist

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