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Laboratory and Field Evaluation of the Efficacy of Four Insecticides for Aedes vigilax (Diptera: Culicidae) and Toxicity to the Nontarget Shrimp Leander tenuicornis (Decapoda: Palaemonidae)

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Abstract:

Laboratory and field evaluations were conducted in southeastern Queensland, Australia, to determine the toxicities of 2 organophosphate compounds (temephos and pirimiphos-methyl), an insect growth regulator (s-methoprene), and Bacillus thuringiensis variety israelensis de Barjac (Bti) to Aedes vigilax (Skuse), an Australian saltmarsh mosquito vector of Ross River virus. The toxicity of these compounds to Leander tenuicornis Say, a cohabiting nontarget shrimp species, was also assessed. s-Methoprene and Bti were found to be the most selective for Ae. vigilax, with selectivity ratios (LC95 nontarget/LC95 target) of 255,000 and 38,000, respectively. In contrast, selectivity ratios of 13 and 0.01 were calculated for temephos and pirimiphos-methyl, respectively. As predicted by the laboratory studies, the field applications of s-methoprene and Bti were highly effective against Ae. vigilax, while not affecting L. tenuicornis survival. In contrast, although temephos and pirimiphos-methyl were both effective against Ae. vigilax, these products also killed 100% of caged L. tenuicornis. s-Methoprene and Bti did not affect water quality, whereas temephos and pirimiphos-methyl significantly influenced pH and turbidity. Accordingly, based on the high selectivity ratios, excellent field efficacy, and lack of influence on abiotic water characteristics, s-methoprene and Bti were ideal for insecticide control of Ae. vigilax in Australian saltmarsh pools.

Keywords: Aedes vigilax; Leander tenuicornis; insecticides; mosquito control; nontarget shrimp; water quality

Document Type: Research Article

Publication date: October 1, 1999

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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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