Toxicity of Selected Insecticides to Catolaccus hunteri (Hymenoptera: Pteromalidae) in the Laboratory

• Published in: The Florida entomologist Vol. 94; no. 4; pp. 1078 - 1080
• Main Authors: Schuster, David J, Thompson, Sandra
• Format: Journal Article
• Language: English
• Published: Lutz Florida Entomological Society 01-12-2011
• Subjects: Adult insects; Beetles; Crop science; Flower buds; Insect larvae; Insecticides; Parasitoids; Peppers; Pests; Scientific Notes; Weevils; United States
• ISSN: 0015-4040; 1938-5102
• DOI: 10.1653/024.094.0454

Selected insecticides were evaluated in the laboratory for residual and topical toxicity to Catolaccus hunteri Crawford, a parasitoid of the pepper weevil, Anthonomus eugenii Cano. Based on predicted LC₅₀ values, chlorpyrifos was highly toxic to the parasitoid both residually and topically, with LC₅₀ values of 0.029 and 0.292 μg[ai]/ mL, respectively. Indoxacarb was non-toxic, with LC₅₀ values of 42.842 and 225.961 μg[ai]/mL, respectively, for residual and topical exposure. Tebufenozide was non-toxic residually (LC₅₀ value of >135,940 μg[ai]/mL) but relatively toxic topically (LC₅₀ value of 0.221 μg[ai]/mL). LC₅₀ values of oxamyl and spinosad both residually (LC₅₀ values of 2.126 and 2.331 μg[ai]/mL, respectively) and topically (LC₅₀ values of 1.847 and 1.299 μg[ai]/mL, respectively) were intermediate between those of chlorpyrifos and indoxacarb. Methomyl was more toxic residually (LC₅₀ value of 0.029 μg[ai]/mL) than topically (LC₅₀ value of 0.292 μg[ai]/mL).