Integrated Management of Potato (Solanum tuberosum L.) Leaf Spot, Caused by Alternaria solani

Results of field experiment studies on integrated management revealed that all the treatments significantly influenced the disease incidence and severity over unsprayed control. However, fungicides (spray) were found most effective in checking the disease, followed by the bioagents and the botanicals. Of the treatments, fungicide, iprodione caused highest reduction (67.04%) in the disease incidence. This was followed by Mancozeb (59.43), SAFF (53.37%) and Chlorothalonil (51.14%). Less than 50% reduction in disease incidence was recorded with Carbendazim (47.48%) followed by Hexaconazole (42.29%), Tebuconazole (41.47), bioagent T. harzianum (35.03%) and botanical A. indica (32.39%). Botanical Z. officinale and bioagent P. fluorescens were found less effective both of which recorded significantly least reduction (28.24) in blight incidence. Highest tuber yield recorded on fungicide Iprodione with (350.26q/ha) and over unsprayed control (yield, 150.20 q/ha) with significantly least mean Alternaria blight incidence (16.16%) and intensity (21.96%). The second and third best fungicides found were Mancozeb (@ 0.2%) and SAFF (0.25%) which recorded tuber yield, respectively of 300.61 q/ha and 288.61q/ha.