The goal of this project is to continue to refine soybean aphid thresholds by determining the impact of row spacing on soybean aphid establishment and population growth. The current recommendation and threshold for soybean aphids (Rice et al. 2005) was designed and appropriate only for 30 inch row spacing and for soybeans up to the R5 stage. As of 2004 soybean row spacing used in Iowa varied, with approximately 50% of growers using a sub 30-inch row spacing (7.5 to 22 inch). Soybean spacing has been shown to influence soybean aphid densities in Korea, however soybean aphid is not considered as significant a pest of soybean production in Asia as it has been within the US. To what extent...
The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.