1a.Objectives (from AD-416):
Advance soybean lines with field resistance to soybean aphid within the South Dakota State University soybean breeding program by crossing with contemporary soybean lines and re-evaluate resistance in crosses.
1b.Approach (from AD-416):
A total of 330 early maturity soybean lines will be scored for resistance to soybean aphid infestation. The lines will be planted annually each in 3-ft long rows in a plot at the Eastern South Soil & Water Research Farm, replicated three times, and scored in August each year.
A total of 330 early maturity soybean lines were planted for evaluation against natural infestation by soybean aphid in summer 2012 in a field plot at the Eastern South Soil & Water Research Farm near Brookings, South Dakota. However, natural infestations of soybean aphid were very low (<100 aphids per plant, well below treatment level), and supplemental infestation with colony-reared aphids did not substantially increase aphid levels. No other incidental pests were present at significant levels so that the lines could be salvaged for alternative evaluation with respect to other pests. The lines have been re-planted in summer 2013 for evaluation against soybean aphid.