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The New Agriculture Network's on-line newsletter with seasonal advice for field crop and vegetable growers interested in organic agriculture.

Vol. 4, No. 4 - June 13, 2007

Parasitoids of soybean aphid in Michigan
Takuji Noma and Michael Brewer
Entomology
Michigan State University
 
SBA density graph
Figure 1. Seasonal Peak SBA densities monitored at two to 11 soybean fields (no insecticides used) in southern Michigan between 2003 and 2006. Dashed line is the recommended spray threshold of 250 aphids per plant.

Hickory Corners
Parasitism of soybean aphid graph.

East Lansing
Parasitism of soybean aphid graph.
Figures 2. Parasitism of soybean aphid sampled at two Michigan locations in 2006 under very low aphid densities.
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