Dacamox, the 5-15% granular formulation of thiofanox (P), 3,3-dimethyl-1-(methylthio)-2-butanone 0-[(methylamino)carbonyl]oxime, was applied to potato crops in furrow at planting as an insecticide in the U.S. and Canada. Less than 0.5 ppm of the anticholinesterase carbamate residues derived from P was found in the tubers harvested from plots treated at the 3 lb (active ingredient) rate in the U.S. and Canada. These residues in potatoes may be reduced significantly by three mechanisms: (1) storage of the tubers at room temperature for 10-20 weeks reduced 48 to 97% of these residues through metabolic degradation;(2) baking and frying potatoes reduced the initial residues 50-90% due to hydrolysis of these residues; and (3) boiling potatoes reduced 30-60% of the initial residues due to water extraction.
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