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The IGR Diflubenzuron and Organophosphorus Insecticides Against Nuisance Midges in Man-Made Residential-Recreational Lakes

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In the laboratory, chlorpyrifos, temephos, and phenthoate were highly active against 4th instars of Chironomus utahensis (Malloch); this species was tolerant to methyl parathion and fenthion. Proclacidius freemani Sublette and P. sublettei Roback were most susceptible to chlorpyrifos and phenthoate but were resistant to temephos. Circotopus bicinctus (Meigen) and C. sylvestris (F.) were most susceptible to phenthoate and least to methyl parathion.

In the field, chlorpyrifos at 0.22 kg AI/ha in 3-m deep lake fingers controlled C. utahensis (6–7 wk), and P. freemani and P. sublettei (beyond 8 wk). At 0.14 kg AI/ha in 4–5 m depths in the entire lake, chlorpyrifos yielded control of the 3 midge species for a comparable duration and extent to that achieved in fingers. The latter treatment also controlled Chirollomus decorus Johannsen. Temephos, at 0.28 kg AI/ha in fingers, yielded excellent control of C. utahensis for 6 wk, but at 0.17 kg AI/ha in main lake areas, it provided mediocre control of C. utahensis and C. decorus. P. freemani and P. sublettei were not affected by temephos treatments. Diflubenzuron [1- (4-chlorophenyl) -3 (2,6-difluorobenzoyl) - urea] at 0.11 kg AI/ha in fingers inhibited emergence of C. utahensis, P. freelllani, and P. sublettei for 3 wk, and at 0.22 kg AI/ha for 4–5 wk. The IGR affected C. decorus only for one wk following treatments.

Document Type: Research Article

Publication date: October 1, 1977

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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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