Soon after the arrival of the soybean aphid, Aphis glycines Matsumura, into North America in 2000, our research program began screening soybean (Glycine max (L.) Merrill) germplasm and wild allies for resistance to the insect pest. A number of resistance sources were identified with antibiosis-type resistance. Antixenosis-type resistance was also found. At least two different resistance loci, possibly multiallelic, have been mapped in the soybean genome to date. Biotype variation in the aphid has also been identified.
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