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Weight Gain of Cereal Leaf Beetle Larvae on Normal and Induced Leaf Pubescence¹

Seeds of wheat (Triticum aestivum L.) germinated and grown in closed petri dishes consistently produced leaves with more pubescence than those grown under natural conditions. Weight gain and percent survival of freshly emerged cereal leaf beetle larvae were measured on seedling plants with increased amounts of pubescence and control plants with normal pubescence.

Larval weight gain on plants of cultivars susceptible and resistant to the cereal leaf beetle with increased densities of pubescence were significantly lower than the weight gain of larvae grown on control plants. These results make it possible to examine the contribution of pubescence to resistance within a single genotype in a manner similar to those comparisons in which pairs of isogenic lines are used.

Key Words: Leaf hairs • Larval survival

² Research Geneticist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture; formerly Postdoctoral Fellow, Department of Crop and Soil Sciences, Michigan State University (now Associate Professor, Huntington College, Huntington, Ind.), Senior Laboratory Technologist; and Associate Professor of Crop and Soil Sciences, Michigan State University, East Lansing, Mich. 48823.

Received for publication November 21, 1970.