Experimental Insect Growth Regulators Against Some Nuisance Chironomid Midges of Central Florida12

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Abstract
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. Preand 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.

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