Type of pesticide and formulation

The toxicity of a specific pesticide is a composite of its physicochemical properties, the method of formulation, and the inherent ability of the honey bee to deal with the material internally. 

Organophosphorus insecticides such as dimethoate, diazinon, malathion, fenitrothion, and parathion are the most toxic to bees. They inhibit the enzyme cholinesterase, which mediates the transmission of nerve signals. These chemicals induce problems of regurgitation (bees are wet), distended abdomen, disorientation, lethargy, paralysis, and so on 

Most herbicides and fungicides are not directly toxic to honey bees. In the same way, sex lures, attractants, and other hormones usually cause no acute toxicity problems for adult bees. Occasionally, a few honey bees and bumble bees have been found in traps containing Japanese beetle lures 

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Acute toxicity of pesticides to bees 59 Type of pesticide and formulation... 

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