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Showing posts from August, 2014

Soybean Aphid Populations mixed, Field Infestations can be quite Different

A quick survey of soybeans around the northwest MN region revealed great variability in soybean aphid populations.
Some fields have not required treatment, many fields have been treated and are in good shape, other fields not treated may have quite variable numbers and often are related to growth stage with R3 fields still vulnerable to losses from threshold populations.

Re-Launch of the Forage Quarterly newsletter

Welcome to a resumption of the Forage Quarterly newsletter. It will provide an informational outlet for the UMN Forage Team.

Soybean aphid thresholds demystified - a satirical examination

prepared by Bruce Potter, IPM Specialist SW MN
University of Minnesota Southwest Research and Outreach Center, Lamberton


Before anyone gets too bent out of shape over this... Yes, I know this is a stressful time for some soybean growers, most of their advisers and for aphid researchers too.   It is not illegal to apply insecticide to any population of soybean aphids as long as it is within label restrictions.  Finally, I am not the police and it's the soybean farmer's money, not mine, at risk. Insecticide resistance does tend to spread itself around though.

Based on emails and phone calls, there seem to be several economic (action) thresholds for soybean aphids in use now.