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Methomyl residues on cigar-wrapper and flue-cured tobaccos in Florida.

Residues of methomyl applied as dust and spray on Florida cigar-wrapper and flue-cured tobaccos, respectively, at various rates and intervals prior to harvest were determined by gas chromatography. Mean residues in ppm ranged from 3.87 to 103.30 on cigar-wrapper and from 0.00 to 0.25 on flue-cured tobacco. Relatively low temperatures during curing (90-95°F) and fermentation (114°F) of cigar-wrapper tobacco apparently caused little residue loss. Weathering and increasing time intervals from last application to harvest materially reduced residues on both tobaccos. Although there is a high methomyl residue on cigar-wrapper tobacco when used as described, it could be reduced by alternating methomyl with less-persistent pesticides in early season applications and by using other means of control during the harvest period.