In 2005, the last heavy soybean aphid (SBA) infestation year was experienced. Michigan State's Ag Statistics data confirm 42% of Michigan's soybean acres were sprayed which raises the question of SBA resistance to insecticides. Most spray failures are attributed to poor timing or coverage without any thought of SBA resistance because of no baseline resistant data. In 2007, a baseline study of SBA resistance to insecticides was funded to determine the baseline susceptibility of SBA from a "never-sprayed greenhouse colony" to measure their susceptibility to field collected SBAs. The researchers were able to develop a reliable assay method for three insecticides along with some baseline...
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.