Journal de physiologie et pathologie végétales

Field Efficacy of Fungicides and Bio-Botanicals against Late Blight Disease of Potato

Rahamatulla Middya, Saidul Islam and Bholanath Mondal

Potato (Solanum tuberosum l.) is one of the most important Solanaceous vegetable crops throughout the world, and a staple food in many parts of the world. Late blight caused by Phytophthora infestans (Mont.) de Bary is a serious disease, affects all parts of potato viz. leave, stem and tubers. The field experiments were conducted at Benuria, Birbhum during Rabi season of 2015-16 and 2016-17 under Red and Lateritic Agro-climatic Zone of West Bengal. The experiments were conducted to find out the effect of fungicides and bio-botanicals against late blight of potato (cv. Kufri Jyoti). It was revealed from the experiment that Ethaboxam 40% SC@1.33 ml/l appeared highly effective. Ethaboxam 40% SC@1.0 ml/l, Ethaboxam 40% SC@0.88ml/l, Ethaboxam 40%SC@0.75 ml/l were reduced the disease incidence successfully. FolioGold (Chlorothalonil 33% + Metalaxyl 3.3%SC), Ishaan (Chlorothalonil 75% WP) and Trichosol (Trichoderma viride) were also efficacious. Trichosol recorded less effective than other treatments. Botanical based treatments were non-effective. Glossiness of the tuber was measured on harvested tubers observing its colour and luster, and graded as more glossy, glossy, less glossy and non-glossy. Indofil M-45, FolioGold, Ishaan and Trichosol produced more glossy tubers while Ethaboxam and other botanical based treatments produced glossy tubers. Less glossy tubers were counted in untreated control.