Laboratory Toxicity of Several Insecticides to the Honey Bee

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Abstract
LD95,s for honey bees (Apis mellifera L.) held 72 hours after mist chamber treatments were as follows: parathion < Phosdrin (1-methoxycarbonyl-1-propen-2-yl dimethyl phosphate) < Guthion (0,0-dimethyl S-4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethyl phosphorodithioate)<phosphamidon <Sevin (1-naphtyhl N-methylcarbamate)<phorate Trithion (S-(p-chlorophenylthio)methyl 0,0-diethyl phosphorodithioate) < DDT < ethion < Phostex (bis(dialkoxy-phosphinothioyl) disulfides (alkyl ratio 25% isopropyl, 75% ethyl). The first five materials had a mean LDg95 of 0.0046%; the next four materials, 0.039%; and the last two materials, 0.57% concentration. These apparent levels of toxicity determined in the laboratory are not necessarily indicative of bee poisoning hazard in the field where residual action is an important factor. Bioassay of laboratory-killed honey bees showed 1.0 microgram of dieldrin per bee; while field-killed bee samples contained 0.5 microgram of dieldrig per bee.

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