New Soybean Aphid Biotype Identified

URBANA, Ind., March 31 (UPI) — U.S. scientists say they’ve identified a new soybean aphid — Biotype 3 — that can multiply on aphid-resistant soybean varieties.

The researcher, led by University of Illinois Professor Glen Hartman, said the soybean aphid is the only soybean insect pest known to have multiple biotypes, and the most recently identified soybean aphid was discovered in Springfield Fen, Ind., on overwintering glossy buckthorn.

Biotype 3 is not distinguishable by its appearance, Hartman said. It was identified by testing the aphid on soybean plants with known resistance genes. The scientists found it was capable of feeding and multiplying on varieties carrying the resistance genes Rag1 and Rag2.

“Identifying a biotype that can overcome Rag1 and Rag2 resistance, even before soybean varieties with these resistance genes were deployed in production, suggests high variability in virulence within soybean aphid populations,” said principal research specialist Curt Hill. “This gives the pest a high potential to adapt to and reduce the effective life of resistance genes deployed in production.”

The study that included Laura Crull, Theresa Herman and David Voegtlin was reported in the Journal of Economic Entomology.

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