Toxicity of insecticides for control of freshwater Culex annulirostris (Diptera: Culicidae) to the nontarget shrimp, Caradina indistincta (Decapoda: Atyidae).
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.
Brown
M D
MD
Queensland Institute of Medical Research, Australia.
Watson
T M
TM
Green
S
S
Greenwood
J G
JG
Purdie
D
D
Kay
B H
BH
D000818:Animals; D001681:Biological Assay; D003465:Culex; D033364:Decapoda; D005618:Fresh Water; D007306:Insecticides; D009032:Mosquito Control / Q000379:methods*; D009946:Organothiophosphorus Compounds; D000002:Temefos
D007306:Insecticides; D009946:Organothiophosphorus Compounds; C014153:pirimiphos methyl; D000002:Temefos