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

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