Resistance of Brassica Lines to the Diamondback Moth (Lepidoptera: Yponomeutidae) in the Field, and Inheritance of Resistance

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Abstract
Selected lines and cultivars of crucifers were evaluated in the field for resistance to the diamondback moth, Plutella xylostella (L.). Larvae failed to develop on dark green, glossy foliage of PI cauliflower 234599 grown in the field, and cabbage inbred lines G 8329, G 9660, and G 9639, although the glossy type was preferred for oviposition. Alteration of waxy material on leaf surfaces of two normal, light green commercial cultivars changed the leaf color to dark green and significantly (P < 0.05) increased oviposition greenhouse experiments. Inheritance studies in the field using one population each of cauliflower and cabbage indicated that the type of resistance exhibited by the darkgreen, glossy foliage used in these experiments was heritable with broad sense heritabilities of 0.75 and 0.88 for cauliflower and cabbage, respectively.

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