Malathion Residues on Vegetable, Berry, and Tobacco Crops1

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Abstract
Spray and dust applications of malathion at the rate of 1-3/4 pounds/acre showed that residues were higher and remained longer on leafy vegetables and tobacco than on fleshy vegetables and berries. In most tests the residues on leafy vegetables remained above 8 ppm for 3 days or longer, and for as long as 14 days on parsley. The residues were about the same from dust, wettable powder, and emulsion concentrate formulations, but those from the emulsions reduced the fastest. Rainfall was a factor in reducing residues. Rainfall of 0.74 inch, occurring 14 days after treatment, reduced the residue from 11 to 2 ppm. Washing of parsley 1 hour after treatment in tap water reduced the residue from 36 to 3 ppm. Residues on leafy vegetables were very low 1 hour after treatment. Residues on tobacco, which were studied to determine the hazard to workers handling the crop, were large, remaining above 8 ppm for 5 days or more, and they were reduced at a slower rate than on leafy vegetables and berries.

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