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Development and Antibiosis of Released Soybean Germplasm Lines Resistant to Mexican Bean Beetle (Coleoptera: Coccinellidae)

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Four soybean (Glycine max (L.) Merr.) germ plasm lines resistant to Mexican bean beetle, Epilachna varivestis Mulsant, were developed and released. These lines, 'HC83- 123-9,' 'HC83-46-1,' 'HC83-46-2,' and 'He83-50-1,' are from the cross 'Pixie' x 'PI 229358' and carry resistance (antibiosis) levels nearly equal to the resistant parent, 'PI 229358.' They were developed by the pedigree breeding procedure, using a systematic laboratory bioassay with Mexican bean beetle larvae to identify resistant plants in each generation. Survival and development of Mexican bean beetle larvae on these lines were similar to that on 'PI 229358.' Larval mortality for each line was 97.3, 90.7, 90.0, and 84.0%, respectively, compared with 27.2 and 98.0% for 'Pixie' (a susceptible control) and 'PI 229358,' respectively. More than half the larval mortality occurred during the first and second stadia. These lines also showed resistance to another soybean defoliator; field screening against defoliation by Japanese beetle, Popillia japonica Newman, confirmed the high levels of resistance of these four lines, with defoliation ratings s2 for all four lines compared with the susceptible cultivar, 'Pixie,' which had a rating of 5 (scale 0-5). The resistant lines are determinate plant types of mid-to-Iate group IV maturity. Because of their earlier maturity (compared with the PIs) and high level of resistance (antibiosis), these lines should be a useful source of resistance for the development of high-yielding soybean cultivars with resistance to the Mexican bean beetle and other soybean defoliators.

Document Type: Research Article

Publication date: February 1, 1989

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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