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The metabolism of 14C-Temik aldicarb pesticide [2-methyl-2-(methylthio)propionaldehyde ¿>-(methylcarbamoyl)oxime] was investigated in greenhouseand field-grown potato plants. Aldicarb was metabolized through oxidation to 2-methyl-2-(methylsulfinyl)propionaldehyde O-(methylcarbamoyl)oxime and 2-methyl-2-(methylsulfonyl)propionaldehyde 0-(methylcarbamoyl)oxime. The former was the major metabolite in the foliage during early stages of plant growth and the latter became the predominant one during maturation of the plant. Sub-sequent degradation of these two carbamate metabolites yielded 2-methyl-2-(methylsufinyl)propionaldehyde oxime and 2-methyl-2-(methylsulfonyl)propionaldehyde oxime. The relative concentrations

The fate of S-methyl-14C Temik aldicarb pesticide in soil was studied under field conditions over two growing seasons. Aldicarb applied at the rate of 3.4 kg/ha in-furrow resulted in I4C-residues of 13.10 ± 0.24 ppm in soil planted to potatoes and 15.36 ± 2.40 ppm in fallow ground. Total 14C-aldicarb equivalents declined to 0.07 ± 0.03 ppm in the cultivated soil and 0.05 ± 0.02 ppm in the fallow ground at 90 days after application. Maximum dissipation rates were associated with heavy rainfalls at various times during the season.Aldicarb sulfoxideand water-soluble metabolites were the principal transformation products of aldicarb remaining in the soil. Volunteer crabgrass growing in the treated fallow ground accumulated 1.15 ppm of total 14C-aldicarb equivalents at the end of the 90-day period. Tomato plants, transplanted and grown for 7 days in the fallow ground at 90 days following treatment, contained <0.01 to 0.06 ppm of total 14C-residues. Fourteen days after in-furrow application of 1.12 kg/ha the residues in the soil were 0.59 ppm of total 14Caldicarb equivalents. They were diluted to 0.02 ppm by discing.

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