Studies on bioefficacy, phytotoxicity and residue of metalaxyl 4% +mancozeb 64% against foliar diseases cauliflower

Abstract

Foliar diseases of cauliflower have become a major constraint in cauliflower growing areas causing qualitative as well as quantitative losses. Therefore, a field experiment was carried out for two years at College of Horticulture, Hiriyur for bio efficacy and phytotoxicity of metalaxyl 4% + mancozeb 64% against foliar diseases of Alternaria leaf blight, Cercospora leaf spot and Downy mildew of cauliflower. Results revealed that all the treatments significantly reduced the leaf spot incidence and intensity, over untreated control. Amongst all the treatments significantly least average disease incidence was recorded with the treatment, with foliar sprays of metalaxyl 4% + mancozeb 64% @ 3g/lit recorded least Percent Disease Index (PDI) ( 5.00, 7.67 and 8.25 respectively) and highest curd yield of 12.92 followed by metalaxyl 4% + mancozeb 64% @ 2.5g/lit.