Management of late blight of potato (Solanum tuberosum L.) through chemical under field conditions Allahabad Uttar Pradesh, India

Abstract

An experiment was conducted for the Management of late blight of potato (Solanum tuberosum L.) by selected systemic and contact fungicides in the research field of Department of Plant Pathology, Sam Higginbottom Institute of Agriculture, Technology and Sciences, Allahabad during Rabi Season of 2013-2014. Seven treatments including control with three replications were taken up using RBD. Treatments comparing of foliar spray of Indofil M-45 (mancozeb 75%), Companion (carbendazim 12% + mancozeb 63%), Ridomil MZ-72 (metalaxyl 8% + mancozeb 64%), Moximate (cymoxanil 8%+ mancozeb 64%), Avtar (hexaconazole 4% + zineb 68%), Lurit (dimethomorph 50%), and control (spray of plane water) were applied at the onset of disease symptoms at 60 DAS. Observations for percent disease intensity were recorded at 10 and 20 days after spray. Minimum Percent disease intensity was recorded in (cymoxanil 8% + mancozeb 64%) at 10 days and 20 days after the spray (10.67% and 13.67%, respectively), followed by dimethomorph 50% (11.67% and 16.00%), as compared to control which recorded maximum percent disease intensity (41.00% and 62.00%, respectively). Maximum yield (q/ha) was recorded in cymoxanil 8% + mancozeb 64% (135.67), followed by dimethomorph 50% (128.33), as compared to control T0 - (67.00, respectively). The highest cost benefit ratio was recorded in T4– cymoxanil 8% + mancozeb 64% (1:1.91), followed by T6 - dimethomorph 50% (1:1.80), as compared to control T0- (1:0.99, respectively).