0863 Assessing Michigan-bred soybean lines for resistance to the soybean aphid (Aphis glycines), and defoliation by the Japanese beetle Popillia japonica

Tuesday, November 18, 2008: 4:38 PM
Room A12, First Floor (Reno-Sparks Convention Center)
Desmi Chandrasena , Entomology Department, Michigan State University, East Lansing, MI
Christina DiFonzo , Entomology Department, Michigan State University, East Lansing, MI
Dechun Wang , Crop and Soil Sciences, Michigan State University, East Lansing, MI
Enhancing soybean germplasm by incorporating resistance to the soybean aphid,Aphis glycines Matsumura, (Hempitera: Aphididae) is important to reduce yield loss and insecticide costs for soybean production in the North Central States. Resistance to soybean aphid (SBA) was screened in three aphid-resistant lines developed by the MSU Soybean Breeding Program (E06901, E06905, E06906) compared to a commercial susceptible variety. Resistant and commercial lines were planted in replicated plots in two locations in MI. Weekly sampling for SBA using whole-plant counts indicated, fewer SBA abundance and lower infestations on resistant lines. Under no-choice conditions using plants infested then caged, resistant lines had lower SBA density than the susceptible line under pressure of natural enemies. In caged plants,when total SBA-abundance/plant after two weeks were counted,both nymphs and adults reproduced less on resistant lines. Within each resistant line, SBA numbers were significantly different between caged and open plants. Clip-cage experiments were conducted, to determine differences in SBA survival, fecundity and longevity on resistant and susceptible lines by restricting individual aphids (1-d-old viviparous aptera) to clip-cages in low, mid and, high positions of a plant. Leaf damage caused by Popillia japonica was assessed on these lines during out-breaks. Results of this study will assist the university Soybean Program, to further enhance these lines as aphid-resistant cultivars suitable for commercial release.

doi: 10.1603/ICE.2016.37495