Abstract
The effect of substitution by alkyl, methoxy, and chloro groups in phenyl methylcarbamates on toxicity to Apis mellifera L. and inhibition of bee head cholinesterase. was examined. Application of Main’s kinetic treatment to inhibition of bee head cholinesterase showed that differences in anticholinesterase activity were mainly attributable to differences in affinity rather than carbamylation. The carbamylation constant k2 was found to be independent of electronic effects produced by the substituents. The relation between anticholinesterase activity and synergized toxicity to the honey bee, a carbamate-susceptible insect, was similar to that previously found with house flies. Some carbamates of low anticholinesterase activity were unexpectedly toxic to bees.
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