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Morphological and Chemical Changes that Evolve in the Development of Host Plant Resistance to Insects¹

ABSTRACT

The hypothesis that insects are evolving from a polyphagous to a monophagous state is presented. Chemical and physical factors involved in host selection by an insect are discussed. Certain morphological and chemical factors in plants have evolved as protective mechanisms against specific insects which have allowed survival. Man has genetically manipulated certain of these chemical and morphological factors to impart resistance to specific pests. In some cases, the factor or factors responsible for resistance to one pest may in themselves, or else through unknown linked factors, create greater susceptibility to another pest. Examples are given.

Key Words: resistance • plants • insects • morphological • chemical • evolution

¹ Paper presented Aug. 19, 1971, in New York City at the annual meeting of the ASA as part of the symposium"Breeding for Host-Plant Resistance to Insect Pests."

² Professor and Head, Department of Entomology, Mississippi Agr. & Forestry Exp. Sta., Mississippi State Univ., State College, Miss. 39762.

Received for publication December 13, 1971.