Vol. 12, Special Issue 7 (2023)

Author(s):
KT Suryawanshi, SD Sawant, IS Sawant and Ahmed Shabeer TP

Abstract:
Twenty four progressive growers were surveyed for understanding the standard disease management practice followed by them and common pesticide residues encountered. Grapes from each vineyard were sampled at harvest using the protocol specified by APEDA –National Referral Laboratory, Pune and multi-residue analysis was performed on LC-MS/MS and GC-MS/MS. Out of 21 farmers only 7 had used biocontrol agents, and numbers of sprays were in the range of 1-3 for diseases, while 1-8 for insect control. Residue analysis indicated that majority of pesticides detected below MRLS, only residues of powdery mildew fungicides, flusilazole and hexaconazole were detected above MRL in 1 and 3 cases respectively. Therefore, application of Triazole fungicides were considered unsafe after 60 days of fruit pruning. In most cases fungicides applied before fruit set were not detected in residue, except that CAA fungicides (dimethomorph, mandipropamid and iprovalicarp) were detected even when applied at 40 days of pruning. CAA fungicides were thus considered safe only during flowering phase. Cymoxanil a fungicide for downy mildew was not detected even when applied up to 60 days of pruning and hence considered safe for application when downy mildew control is needed after fruit- set. Potassium salt of phosphoric acid in combination with mancozeb was safe up to 60 DAP.