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Yield Losses and Host Selection of Cereal Leaf Beetles in Resistant and Susceptible Spring Barley^1,2,

Yield losses of spring barley, Hordeum vulgare L., caused by feeding of the cereal leaf beetle (CLB), Oulema melanopus (L.), were determined by comparing yields of insecticide-treated plots with CLB-infested plots. The CLB caused substantial grain losses in three field tests in Michigan in 1974 and 1975. The average yield loss of seven susceptible barley cultivars in the three tests was 38% due to an estimated peak density of 1.6 larvae/stem. A CLB-resistarit line from the USDA World Small Grain Collection, CI 6469, and USDA-SEA No. 70222 with CI 6469 and CI 6671 in its parentage, produced high yields in beetle-infested plots. In general, fewer CLB eggs and larvae were found on the resistant barleys than on the susceptible cultivars. It appears possible to use plant resistance in spring barley to reduce yield losses caused by the CLB.

Key Words: Oulema melanopus (L.) • Hordeum vulgare L. • Plant resistance ot insects • Nonpreference • Antixenosis • Insect damage

² Mention of a proprietary product in this paper does not constitute an endorsement of the product by the USDA.

Received for publication March 6, 1979.