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Soybeans
Volume 58 Number 16 Date 08/22/2013 SOYBEAN APHID - Densities have increased this month in most fields, with about 5% of surveyed sites containing economic counts of 250-587 per plant and 16% showing moderate averages in the range of 50-249 per plant. Only two fields, one each in Waushara and Waupaca counties, had economic populations when the same fields were sampled during the first half of the survey in July. Populations in 22% of fields decreased from July to August, suggesting these sites have been treated for control of this pest in the last few weeks. The preliminary state average aphid count is 49 per plant as of August 21, although the second half of the survey is incomplete. All soybean acreage should be evaluated one last time in the next few days since control measures may be justified and foliar treatment is not economical for soybeans beyond the R5.5 growth stage. -- Krista Hamilton, DATCP Entomologist 
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