Resistance in Four Oat Lines to Two Biotypes of the Greenhug123

Abstract
Four lines of common oats, Avena sativa L., were tested in the greenhouse to determine their type of resistance to 2 biotypes of Schizaphis graminum (Rondani). PI 186270 showed antibiosis, nonpreference, and tolerance to biotype C, the biotype predominant in the Great Plains. CI 4888 showed antibiosis, nonpreference, and tolerance to biotype B. CI 1579 and 1580 showed antibiosis to biotypes B and C and non preference to biotype C.

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