Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 8/14/2002
Publication Date: N/A
Technical Abstract: Soybean dwarf virus (SbDV) causes an important disease of soybeans in Japan and is transmitted by Aphis glycines in Indonesia. In the United States, it has been reported infecting forage legumes. With the recent discovery of A. glycines in North America, we surveyed six species of clovers in 33 counties in the state of Illinois in 2001 and tested them for SbDV by triple antibody sandwich enzyme-linked immunosorbent assay and polymerase chain reaction. We detected the virus only in red clover (Ttrifolium repens), in 62% of the plants sampled. We also analyzed 87 soybean plants collected in Illinois in 2000, and 981 plants collected in 2001, but none tested positive for SbDV. We conducted transmission studies with aphid species that were found colonizing clover and soybean plants. Aphids of the species Nearctaphis bakeri and Aphis craccivora vectored SbDV among red clovers, and N. bakeri transmitted SbDV from red clover to soybean. However, A. glycines did not transmit SbDV; neither did two other clover-infesting aphid species, Acyrthosiphon pisum and Therioaphis trifolii.