Residue analysis of newer fungicidal molecule Azoxystrobin 8.3% w/w + Mancozeb 64.75 w/w and management of Anthracnose of Grapes

A field trial was conducted during August (2011) to January (2012) at Theenampalayam village of Coimbatore district in Tamil Nadu to study the effect of Azoxystrobin 8.3% w/w + Mancozeb 64.75 w/w on anthracnose of grapes. Azoxystrobin 8.3% w/w + Mancozeb 64.75 w/w at a dose of 1500 g ha-¹ effectively controlled anthracnose of grapes. Average initial deposition of Azoxystrobin was in the range of 0.38 to 0.16 mg kg-¹ (single dose i.e., 1500 g ha-¹) and 0.67 to 0.29 mg kg-¹ (double dose i.e., 3000 g ha-¹). Further, the average initial deposition of mancozeb was in the range of 2.50 to 1.19 mg kg-¹ (single dose i.e., 1500 g ha-¹) and 4.17 to 1.98 mg kg-¹ (double dose i.e., 3000 g ha-¹). Residues of azoxystrobin and mancozeb dissipated to the below detectable limits within 7 days after spray at recommended dosage