Antibiosis Effect of Sorghum on the Convergent Lady Beetle (Coleoptera: Coccinellidae), a Third-Trophic Level Predator of the Greenbug (Homoptera: Aphididae)
Authors: RICE, MARLIN E.; WILDE, GERALD E.
Source: Journal of Economic Entomology, Volume 82, Number 2, April 1989 , pp. 570-573(4)
Publisher: Entomological Society of America
Abstract:The effects of a tri-trophic level (grain sorghum-greenbug-coccinellid) interaction were examined in the laboratory using greenhouse-grown plants. Two resistant sorghum, Sorghum bicolor (L.) Moench, hybrids, Dekalb DK-41 Y and DK-59E, which exhibit antibiosis to green bugs, Schizaphis graminum (Rondani), were tested along with a greenbug- susceptible hybrid, Horizon 101G. Single egg clusters from Hippodamia convergens Guerin females were randomly separated at hatching into two groups. Each group was fed greenbugs from either a resistant or susceptible grain sorghum hybrid. Plant antibiosis reduced larvalpupal survival and increased the amount of time from egg eclosion to pupation in coccinellids that fed on greenbugs from both of the resistant hybrids compared with the susceptible hybrid. Survival to adulthood was 82.9% in the 101G-susceptible treatment and 62.1% for larvae fed greenbugs from resistant DK-41 Y. Survival was 91.6% in the susceptible 101G treatment and 86.5% in the resistant DK-59E treatment. Resistant sorghum hybrid DK-59E had a significant treatment-by-sex interaction effect on coccinellid adult weights, with females that consumed greenbugs from the resistant hybrid weighing less, whereas males weighed more when compared with the respective sexes feeding on greenbugs from the susceptible sorghum hybrid.
Document Type: Research Article
Publication date: April 1, 1989
- 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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