Toxicity of Insecticides for Control of Freshwater Culex annulirostris (Diptera: Culicidae) to the Nontarget Shrimp, Caradina indistincta (Decapoda: Atyidae)

Authors: Brown, Michael D.; Watson, Tonya M.; Green, Susannah; Greenwood, Jack G.; Purdie, David; Kay, Brian H.

Source: Journal of Economic Entomology, Volume 93, Number 3, June 2000 , pp. 667-672(6)

Publisher: Entomological Society of America

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Abstract:

Laboratory evaluations were conducted in southeastern Queensland, Australia, to determine the toxicities of two organophosphate compounds (temephos and pirimiphos-methyl), an insect growth regulator (s-methoprene), and an entomopathogenic bacterium (Bacillus thuringiensis variety israelensis de Barjac [B.t.i.]) to Culex annulirostris (Skuse), an Australian freshwater mosquito vector of arboviruses, and to Caradina indistincta Calman, a co-habiting nontarget shrimp species. S-methoprene and B.t.i. were safest for Cx. annulirostris control with lethal dose ratios (LC₉₅ nontarget/LC₉₅ target) of 3,300 and 846,000, respectively. In contrast, lethal dose ratios for temephos and pirimiphos-methyl were 0.05 and 0.00005, respectively, suggesting that they are environmentally unsuitable. Based on their high lethal dose ratios, s-methoprene and B.t.i. are recommended for control of larval Cx. annulirostris in Australian freshwater habitats.

Keywords: Culex annulirostris; Caradina indistincta; Bacillus thuringiensis; insecticides; insect growth regulator; nontarget shrimp

Document Type: Research article

Publication date: 2000-06-01

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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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Toxicity of Insecticides for Control of Freshwater Culex annulirostris (Diptera: Culicidae) to the Nontarget Shrimp, Caradina indistincta (Decapoda: Atyidae)

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