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Evaluation of Early Generation Soybeans for Resistance to Soybean Looper¹

The soybean [Glycine max (L.) Merr.] cultivar ‘Davis’, P.I. 229358, and F₁ and F₂ generations from the cross Davis X P-I- 229358 were grown in a greenhouse and rated visually for leaf-feeding damage by soybean looper [Pseudoflusia includens (Walker)]. Parents and 365 F₃ lines were then rated for leaf-feeding damage by soybean looper in a field cage. The rating on F₂ plants in the greenhouse was significantly correlated (r = 0.52) to the rating of their F₃ lines in the field cage. The average rating of F₃ lines changed 0.6 unit for each unit change in the rating of F₂ plants (b = 0.61). Data from parents and F₂ plants suggested no dominance for resistance to feeding by soybean looper. The F₂ distribution was skewed in the direction of the susceptible parent. The study indicated that large numbers of F₂ plants segregating for reaction to leaf-feeding by soybean looper may be effectively evaluated in the greenhouse.

Key Words: Glycine max (L.) Merr. • Pseudoplusia includens (Walker) • Host-plant resistance

² Research geneticist, research entomologist, and research agronomist, ARS-USDA, Stoneville, MS 38776.

Received for publication September 20, 1976.