In the laboratory, 3 IGRs, diflubenzuron, Bay SIR-8514 [1-(4-trifluoromethoxyphenyl)-3- (2-chlorobenzoyl)-urea], and Stauffer MV-678 [2-methoxy-9-(4-isopropylphenyl)-2,6-dimethylnonane], and JHA Stauffer R-20458 [1-(4'-ethylphenoxy)-6,7-epoxy-3,7-dimethyl-2-octene] were bioassayed against field-collected 4th in stars of Chironomus decorus Johannsen and Glyptotendipes paripes Edwards. A 25% WP and a 0.5% G of SIR-8514, a 25% WP of diflubenzuron, and an EC 4 of MV- 678 were evaluated against natural populations of C. decorus, Goeldichironomus holoprasinus (Goeldi), and Tanytarsus spp. in experimental ponds. The WP of SIR-8514 also was applied against the former 2 species in a sewage polishing pond. Pre- and posttreatment benthic larval populations and adult emergence were assessed. Ditlubenzuron and SIR-8514 caused 90% mortality of C.decorus and G. paripes at 4-22 ppb in the laboratory, while LC90 of MV-678 for the 2 species ranged from 50–69 ppb. R- 20458 was the least active; LC90=0.24-0.7 ppm. In experimental ponds, WP and G of SIR-8514 at 56 and 112 g AI/ha affected Tanytarsus spp. and G. holoprasinus more than C. decorus, giving an excellent overall control of these midges for ca. 3 wk. Diflubenzuron at 28 and 56 g AI/ha was slightly more effective than SIR-8514 and far more than MV-678 applied at comparable rates. MV-678 gave a maximum 30% control of total midges at 56 g AI/ha and 70% at 112 g AI/ha. MV-678 applied at rates higher than 0.12 kg AI/ha may produce better results. In the sewage pond, SIR-8514 at 70 g AI/ha completely suppressed midge emergence for at least 10 days after treatment. The 3 IGRs offer a good potential for midge control.
Document Type: Research Article
Publication date: April 1, 1980
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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.