A wild potato species, Solanum berthaultii Hawkes, and its interspecific hybrids with the commercial potato, S. tuberosum L., were evaluated for resistance to the Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say) in field and laboratory studies in New York. Field-collected summer adults produced nearly 3-fold more eggs on S. tuberosum cv. Katahdin than on S. berthaultii over a 7-day period. Egg masses laid on ‘Katahdin’ were 61% larger than those laid on S. berthaultii. In field cage plots of S. berthaultii, CPB larval development was retarded and very few larvae survived to adulthood. Densities of overwintered CPB adults and defoliation levels were significantly reduced on S. berthaultii compared with S. tuberosum in open field studies. A hybrid family had intermediate levels of defoliation and adult CPB densities. During the second CPB larval generation, densities of small (first and second instars) and large (third and fourth instars) larvae were reduced 90 and 87%, respectively, on the hybrid family and 96 and 97%, respectively, on S. berthaultii compared with cpa densities on S. tuberosum. In other field studies, three to four applications of insecticides timed by use of action thresholds were sufficient to maintain acceptably low levels of defoliation on three hybrid families, one application was needed on S. berthaultii, but three applications failed to control CPB on S. tuberosum.
Document Type: Research Article
Publication date: June 1, 1985
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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.