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Resistance of selected Soybean Genotypes and Segregating Populations to Cabbage Looper Feeding¹

Soybean [Glycine max L. (Merr.)] introductions PI 171451, PI 227687, and PI 229358; commercial cultivars ‘Amsoy 71’ and ‘Beeson’; and F₃ and F₄ generations of four resistant-susceptible crosses were field tested for resistance to leaf feeding by second-instar cabbage looper larvae (Trichoplusia ni Hubner). The three plant introductions were highly significantly more resistant than the two commercial cultivars. The parental range in feeding scores was recovered in the F₄ generation even though the number of progenies was small. Heritabilities were estimated by correlation of F₃ with F₄ feeding scores and ranged from 6 to 44%. The possible linkage of maturity genes with genes for resistance to cabbage looper feeding in the plant introductions (maturity adapted to the Southern U.S.) did not appear to be a factor in transferring resistance to cultivars adapted in more northern latitudes.

Key Words: Glycine max (L.) Merr. • Heritability • Trichoplusia ni Hubner • Insect resistance

² Research agronomist, Crop Production Research Unit; and research entomologist, Biological Control of Insects Research Unit, ARS/USDA, Columbia, MO 65201.

Received for publication May 5, 1976.

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