Cost effective management of early blight disease of potato (Solanum tuberosum) caused by Alternaria solani

Early blight disease of potato (Solanum tuberosum L.) caused by Alternaria solani (Ellis and Martin), is one the most important fungal throughout growing areas. Field experiments were conducted during winter (rabi) season, 2018–19 2019–20 at Vegetable Research Centre, Govind Ballabh Pant University Agriculture Technology, Pantnagar, Uttarakhand for evaluating fungicides against early potato. All (mancozeb, hexaconazole, difenoconazole chlorothalonil) evaluated in vitro using poison food technique as well field conditions. In study revealed that chlorothalonil 75% wp gave best results showed 18.0 mm, 17.67 16.33 12.33 mm 8.33 mycelial growth @25 ppm, 50 100 150 ppm 200 concentration 7 days after inoculation. condition, WP @0.2% applied foliar sprays 10 interval resulted lowest severity i.e. 22.50% with highest tuber yield (317.90 q/ha). The findings regarding economics cultivation clearly treatment benefit cost ratio 2.96. may be controlled applying a 0.25 three times 10-day interval, which increased production provided extra benefits to farmers.