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Field evaluation of the phototoxin alpha terthienyl for reducing larval populations of black flies diptera simuliidae and its impact on drift of aquatic invertebrates



Field evaluation of the phototoxin alpha terthienyl for reducing larval populations of black flies diptera simuliidae and its impact on drift of aquatic invertebrates



Canadian Entomologist 123(3): 439-449



The efficacy of alpha-terthienyl (.alpha.-T) for reducing larval populations of black flies was determined in two streams in southeastern Ontario [CanadA]. By 24 h post-treatment, larval black fly population reductions greater than 90% resulted from exposure to calculated dosages of 0.04 and 0.10 mg .cntdot. L-1 .alpha.-T emulsifiable concentrate over distances of 1.0 and 1.5 km, respectively. Significant population reductions were not observed 2.3 km downstream from injection of the 0.10 mg .cntdot. L-1 dosage, probably because a marshy area upstream from this sampling site slowed the transport and enhanced photodegradation of .alpha.-T. Alpha-terthienyl initiated catastrophic drift of benthic invertebrates that was not selective for any functional feeding group. Significant increases in post-treatment drift, relative to pre-treatment densities, were observed downstream from treatment for eight of 10 taxa studied and included filter-feeders, grazers, and predators. Upstream from treatment, significant increases between sampling days were observed for only two taxa. The catastrophic and nonselective impact of .alpha.-T on invertebrate drift preclude its usefulness as an alternative to black fly larvicides used currently, although specialized applications for .alpha.-T may exist in integrated black fly control programs.

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Accession: 007349616

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