Degradation of Myclobutanil Residue in Banana

Field experiments were conducted to study residue and degradation of myclobutanil in banana.Myclobutanil residues were quantified by gas-liquid chromatography with nitrogen and phosphorus detection(GC-NPD).In Trial Ⅰ,we investigated the myclobutanil degradation following application at a recommended dose level.In Trial Ⅱ,we investigated effects of application rates and application times on the myclobutanil in banana.The results showed that myclobutanil dissipated rapidly from both banana pulp and peel,and their half-lives were 10.4 d and 7.7 d,respectuively.When banana trees were sprayed 4 times with myclobutanil at the recommended dose level,it residue in the banana pulp was 0.239 mg·kg-1 at harvest fruit, and the safe interval was 20 days before harvesting.The results showed that myclobutanil is safe for use in controlling diseases on banana.