Pesticide contact dosage

Once the percentage of pesticide that is absorbed and the dermal contact are known, the absorbed dosage can be calculated. 

The dilemma in many horticultural pest problems is how to satisfy the commercial requirement for blemish-free produce, while at the same time ensuring that there are preferably no residues of any pesticide. Frequent harvesting over several months also demands that labourers are in close contact with treated crops. While low dosages are applied by space treatments, care is needed when applications are applied too frequently. Furthermore, the ventilation required before re-entry of an area treated with a fog or mist will dissipate any pesticide still airborne to other areas outside, although the amount airborne after six hours is relatively small. 

Ihe two basic determinants of human health hazard for toxic chemicals, including pesticides, are exposure (or dosage) and toxicity (or effect). Information on both these determinants of hazard is necessary in arriving at a risk assessment for a particular pesticide or pesticide usage. The exposure parameter is particularly important for agricultural workers because of their relatively greater contact with pesticides than is true for the general population. 

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