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Leaf Pubescence and Cereal Leaf Beetle Resistance in Triticum and Avena Species¹

Oats (Arena sativa L.) are not highly resistant to the cereal leaf beetle (Oulema melanopus (L.)) and do have pubescent leaves. Certain lines of A. sterilis L. are pubescent. Since this pubescence is not of the same length and density as that found in wheats resistant to the cereal leaf beetle, it was the purpose of this investigation to determine whether A. sterilis plants would produce a resistant reaction to the insect as measured by larval weight gain of first instar larvae and ovipositlon tests on seedling plants. The pubescent A. sterilis lines were significantly different from the susceptible check at the 10% level suggesting the possibility of further intensification of their resistance.

Key Words: Larval feeding damage • Larval weight gain • Oviposition • Arena sterilis

² Research Geneticist and Research Entomologist, North Central Region, ARS, USDA, East Lansing. MI 48824.

Received for publication July 7, 1973.