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1 June 2000 Toxicity of Insecticides for Control of Freshwater Culex annulirostris (Diptera: Culicidae) to the Nontarget Shrimp, Caradina indistincta (Decapoda: Atyidae)
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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.

Michael D. Brown, Tonya M. Watson, Susannah Green, Jack G. Greenwood, David Purdie, and Brian H. Kay "Toxicity of Insecticides for Control of Freshwater Culex annulirostris (Diptera: Culicidae) to the Nontarget Shrimp, Caradina indistincta (Decapoda: Atyidae)," Journal of Economic Entomology 93(3), 667-672, (1 June 2000). https://doi.org/10.1603/0022-0493-93.3.667
Received: 23 August 1999; Accepted: 1 February 2000; Published: 1 June 2000
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