Dissipation of Penconozole, Hexaconozole and Myclobutanil in Grapes

Two sprays of penconozole @ 0.05%, hexaconozole and myclobutanil @ 0.1% was given to Tompson seedless variety of grapevine, first at berry formation stage and second at 15 days after first spray. Residue analysis at different time intervals revealed that the initial deposits of penconozole (0.61 mg kg⁻¹), hexaconozole (0.38 mg kg⁻¹) and myclobutanil (2.19 mg kg⁻¹) dissipated to 0.01, 0.01 and 0.07 mg kg⁻¹ by 30 days after second spray amounting to the loss of 98.0, 97.9% and 96.8%, respectively. The waiting perrods of 2.5, 5.1 and 2.5 days have been suggested for penconozole, hexaconozole and myclobutanil, respectively.