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Published in Crop Sci 20:760-766 (1980)
© 1980 Crop Science Society of America
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Diallel Analyses of Resistance to the Adult Pea Leaf Weevil in Peas1

D. L. Auld, L. E. O'Keeffe, G. A. Murray and J. H. Smith2

Plant Introductions (FI) of peas (Pisum sativum L.) resistant to the adulit pea leaf weevil, Sitona lineatus (L.) were crossed to cultivars of winter peas [P. sativum subsb. arvense (L.) Poir] and spring peas in a nonreciprocal diallel manner. The eight parental lines and F1 and P2 populations were evaluated for resistance to the pea leaf weevil under laboratory and/or field conditions. Combining ability analyses indicated that significant variation due to general combining ability (GCA) effects were present for resistance to the adult pea leaf weevil. Specific combining ability (SCA) had a significant effect on weevil resistance in only half of the eight analyses. There appeared to be sufficient GCA to support a breeding program for the development of weevil resistant cultivars. PI 263010 and PI 3-13983 had large negative GCA estimates and appear to be the best parents to use in the development of resistant cultivars. These PI’s were generally more resistant than the commercial cultivars tested in both field and laboratory evaluations. The PI’s expressed resistance under the intense pressure of 16 adult pea leaf weevils per plant in the laboratory.

Key Words: Combining ability • Sitona lineatus (L.) • Pisum sativum L • Host plant resistance

1 Contribution of Deps. of Plant and Soil Sciences and Entomology, Univ. of Idaho, Moscow, ID 83843. Approved for publication by the Director of the Idaho Agric. Exp. Stn. as Research Paper No. 8701.

2 Assistant professor of plant breeding and genetics, associate professor of entomology, professor of crop physiology, and research associate of entomology.

Received for publication January 14, 1980.




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