Foliage plant production

In the first year, the maximum concentrations of sulfoxide and sulfone in soil, seed potatoes, and foliage were approximately 2, 2, and 6 times, respectively, the concentrations of those metabolites measured in the second and third year treatments. These results demonstrated that enhanced microbial degradation of relatively minor insecticidal compounds in the soil can significantly affect insecticide levels in the plant (when these degradation products are the major insecticidal component accumulated). As the sulfoxide and the sulfone metabolites are the major toxicants in the foliage of potato plants grown in disulfoton-treated soil, this reduction in toxicant residues overtime can be expected to reduce insecticide efficacy. 

Plant. Degrades in plants to 4-hydroxy-2,5,6-trichloroisophthalonitrile (Hartley and Kidd, 1987), l,3-dicyano-4-hydroxy-2,5,6-trichlorobenzene, and l,3-dicarbamoyl-2,4,5,6-tetrachloro-benzene (Rouchaud et al., 1988). No evidence of degradation products were reported in apple foliage 15 d after application. The half-life of chlorothalonil was 4.1 d (Gilbert, 1976). 

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