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Inheritance of Resistance to the Adult Pea Leaf Weevil in Austrian Winter Peas¹

In recent years the pea leaf weevil (Sitona lineatus L.) has severely damaged the dry pea (Pisum sativum L.) crop in the Pacific Northwest. The defoliation of pea seedlings in the early spring by the adult pea leaf weevil results in severe stand depletion and reduced seed yield. The inheritance of resistance to the pea leaf weevil in Austrian winter peas [Pisum sativum subsp, arvense (L.) Poir] was studied by crossing in a non-reciprocal diallel manner, eight genotypes that exhibited different levels of pea leaf weevil resistance. Parental and F₂ seedlings were exposed to an average of 7.8 adult pea leaf weevils/seedling in the greenhouse and were rated for foliar damage and terminal leaflet injury. Twenty-five selected F₃ plants were progeny tested as F₃ families. Data from parental lines and F₂ populations were analyzed together and means separated by least significant differences. Diallel analyses indicate that differences in the pea leaf weevil resistance were due to specific combining ability. Very low estimated narrow sense heritabillties of —2.6 and —5.6% were estimated for foliar damage and terminal leaflet injury, respectively. This indicates that pea leaf weevil resistance could probably not be improved by selection within the populations that we studied. The F₃ progeny test showed that selection was not successful in increasing the level of insect resistance.

Key Words: Combining ability • Sitona lineatus L. • Pisum sativum subsp. arvense (L.) Poir • Progeny test • Heritability

² Former graduate assistant in entomology, assistant professor of plant breeding and genetics, associate professor of entomology, and former assistant professor of plant breeding and genetics.

Received for publication February 18, 1978.