Effects of Cyromazine on Larval Survival, Pupation, and Adult Emergence of Colorado Potato Beetle (Coleoptera: Chrysomelidae)
Authors: SIROTA, J. M.; GRAFIUS, E.
Source: Journal of Economic Entomology, Volume 87, Number 3, June 1994 , pp. 577-582(6)
Publisher: Entomological Society of America
Abstract:Results of laboratory and field experiments to test the effects of the insect growth regulator cyromazine on Colorado potato beetle, Leptinotarsa decemlineata (Say), are reported. We describe symptoms of cyromazine poisoning of larvae. When second instars were fed cyromazine-treated potato foliage in laboratory bioassays, all larvae died within 10 d. Second instars of the insecticide-resistant Long Island strain survived longer than those of the susceptible Vestaburg strain when fed a low concentration, but survival between strains fed at a higher concentration did not differ. Survival to pupation of fourth instars fed cyromazine-treated foliage was 12-16% lower than that of controls, but the differences were not significant. Treated larvae pupated later and were less likely to develop into adults than untreated larvae. In the field, cyromazine sprays reduced the number of first and second instars and affected third and fourth instars by inhibiting feeding and lowering rates of pupation. Cyromazine treatment reduced adult emergence 53-fold and increased yield of size-A potatoes 2- to 4.5-fold compared with results from untreated plots. The effectiveness of cyromazine at low rates and on all stages of insect development makes it a valuable addition to integrated pest management programs for Colorado potato beetle.
Document Type: Research Article
Publication date: June 1994
- 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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