Toxicity Of Spinosad Research Articles

Toxicity of spinosad to susceptible and resistant strains of house flies,Musca domestica

The toxicity of spinosad, a new insecticide derived from the bacterium Saccharopolyspora spinosa, was evaluated against susceptible and resistant strains of house fly (Musca domestica L.). Spinosad was highly toxic to house flies based on 72-h LD50 values and the symptoms of poisoning were consistent with a neurotoxic mechanism of action. Spinosad was relatively slow acting, with the maximum toxicity noted at 72 h. Piperonyl butoxide and S,S,S,-tribu-tylphosphorotrithioate synergized the toxicity of spinosad by 3·0- and 1·8-fold, respectively, while diethyl maleate had no significant effect. These results suggest that there is a small degree of monooxygenase-mediated spinosad detoxification in house flies, while hydrolases may be only minimally important and glutathione transferases may have no role. There were no substantial levels of cross-resistance detected, except in the LPR strain where a low 4·3-fold cross-resistance was observed. The cyclodiene-resistant OCR strain was 2·7-fold more sensitive to spinosad than the susceptible strain (CS). These results suggest that cross-resistance may not be a limiting factor for the use of spinosad against house flies. © 1998 Society of Chemical Industry

Toxicity of spinosad to susceptible and resistant strains of house flies, Musca domestica

Toxicity of spinosad to susceptible and resistant strains of house flies, Musca domestica

Laboratory Toxicity of Spinosad to Late Second Instar Tobacco Budworm Compared to Commercial Standards, 1994

Abstract The relative activity of spinosad was studied utilizing late second instar tobacco budworm each confined on a treated cotton leaf disc in a one ounce vented plastic cup. The discs were dipped in solutions using 4-fold dilutions. Ten replicates of one larva each were infested after drying at each dose and generally 5 dosage levels were used in the tests. Each paired comparison was done side by side and evaluated 72 hours after infestation.