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Leaf Pubescence of Field Grown Wheat: A Deterrent to Oviposition by the Cereal Leaf Beetle¹

ABSTRACT

Leaf pubescence, a deterrent to oviposition by the cereal leaf beetle [Oulema melanopus (L.) Diptera Cecidomyiidae], is being bred into wheats in an attempt to replace insecticides as a means of controlling damage by this insect pest. Experimental wheats (Triticum aestivum L.) having more than 71 trichomes/mm² of flag leaf surface were nonpreferred for oviposition by the cereal leaf beetle compared with Arthur wheat which has 28 trichomes/mm². The leaf pubescence of three Purdue wheats was responsible for over 94% reduction in the number of eggs that were laid by the beetle and the number of leaves damaged by feeding larvae.

Key Words: resistance to insects • nonpreference • mechanisms of resistance

¹ Journal paper no. 4866. Purdue University, Agr. Exp. Sta., Lafayette, Ind. 47907.

² Research Entomologist, North Central Region, Lafayette Research Area, ARS, and Professor of Entomology, Purdue Univ.; Agronomist, North Central Region, Lafayette Research Area, ARS, and Graduate Instructor, Dep. of Agron., Purdue Univ.; Research Associate, Botany & Plant Pathology Dep., Purdue Univ.; and Professor of Agronomy, Dep. of Agron., Purdue Univ.

Received for publication September 15, 1972.