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Resistance in Soybeans to the Mexican Bean Beetle: II. Reactions of the Beetle to Resistant Plants¹

Mexican bean beetles (Epilachna varivestis Mulsant) displayed differential preference reactions when fed foliage from resistant soybean (Glycine max (L.) Merrill) genotypes PI 229358, PI 227687, and PI 171451. These reactions included reduced longevity and fecundity in adults and weight loss and high mortality in larvae. These symptoms appeared similar to starvation and hypothetically resulted from reduced consumption of resistant foliage by the insects.

Larvae tended to fall from plants of the genotypes PI 229358 and PI 171451 possibly because lack of feeding stimulants or presence of repellents caused high larval movement and leaf surfaces provided poor footing for the insects.

Key Words: Epilachna varivestis Mulsant • Glycine max (L.) Merr. • Host plant resistance • Insect resistance • Non-preference

² Former Graduate Research Assistant, Department of Entomology (now Extension Entomology Specialist, North Carolina State University, Tidewater Experiment Station, Plymouth, N. C.); Professor of Entomology; and Associate Professor of Agronomy, Clemson Univ. Clemson, S. C. 29361, respectively.

Received for publication November 6, 1971.

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