Laboratory toxicity of insecticides to workers of Trigona spinipes (F., 1793) (Hymenoptera, Apidae)
Oilton J. D. Macieira And Maria Jose A. Hebling-Beraldo
The laboratory LD50 values of organophosphate, carbamate, organochlorine (including cyclodienes) and pyrethroid insecticides were determined for workers of Trigana spinipes (F., 1793). Determinations used topical application techniques from which dose-morality was derived using Bliss' method (1935). In order of decreasing toxicity the LD50 values for workers, in µg/bee were as follows: heptachlor, 0.0168; dieldrin, 0·0289; cypermethrin, 0·0704; permethrin, 0·0724; parathion, 0·0956; lindane, 0·1331; methomyl, 0·1402; dicrotophos, 0.1685; endosulfan, 0.2097; malathion, 0.2649; acephate, 0.4234; carbaryl, 0.7472; fenvalerate, 1·0880. The insecticides tested were highly toxic to T. spinipes.