Disappearance of captan and propiconazole in fruits and leaves of Jonagold apple.

摘要

Studies on disappearance of captan and propiconazole residues in fruit and leaves of apple cv. Jonagold were carried out. The initial deposits of captan on leaves were 4.911+or-0.476 micro g/cm2 and disappeared according to exponential relations corresponding to first order rate equation P=5.4806e-0.0437t (R2=0.9472). The initial deposits of that fungicide in fruits were 1.300+or-0.281 mg/kg and disappeared according to exponential equation P=1.443e-0.0459t (R2=0.8846). The initial deposits of captan on leaves and fruits dropped by half within 16 and 15 days after treatment, respectively. The initial deposits of propiconazole on leaves were 0.111+or-0.049 micro g/cm2 and disappeared according to exponential relations corresponding to first order rate equation P=0.0974e-0.0408t (R2=0.885). The initial deposits of that fungicide in fruits were 0.052+or-0.027 mg/kg and disappeared according to exponential equation P=0.0343e-0.0553t (R2=0.839). The initial deposits of propiconazole on leaves and fruits dropped by half within 17 and 13 days after treatment, respectively.