The introduction of the soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), in 2000, has increased the potential of insect transmission of viruses to soybean. In an effort to control this pest along with the spread of disease, various adapted soybean lines were screened for resistance to aphid colonization and compared to lines reported to exhibit partial resistance. These soybean lines, grown in an insect-free greenhouse, were transported to a house with high soybean aphid pressure and evaluated after an incubation period of 12-14 days. Aphid counts on individual plants were taken to assess the ability of the soybean aphid to colonize the different lines. Although many soybean lines showed a great degree of variability in aphid numbers, less than 2% of 219 tested Wisconsin adapted soybean lines appeared partially resistant. In this experiment, relatively low aphid populations, averaging less than 60 aphids per plant, characterize resistance to the soybean aphid. Results from this study confirm CNS (PI 548.445), Dowling (PI 548.663), Jackson (PI 548.657), Palmetto, and PI 71506 as partially resistant to Aphis glycines. Currently, select midwestern lines from this greenhouse study have been planted in field trials to further investigate levels of aphid resistance and virus transmissibility.
Species 1: Homoptera Aphididae Aphis glycines (soybean aphid)
Keywords: host plant resistance
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