Survey and management of black scurf disease in potato

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Potato (Solanum tuberosum L.), is an important vegetable crop grown throughout India and it play very important role in the supply of the nutrients to the under nourished vegetarian population of the country. Black scurf and stem canker diseases of potato is caused by the Rhizoctonia solani Kühn is one of the wide spread and destructive diseases in world. For minimizing the losses caused by black scurf need inexpensive and environmentally safe management practices. The present investigation regarding to studies on Survey and management of Black scurf disease of Potato was carried out during Rabi season 2020-21 at laboratory of department of Plant Pathology and field experiments were conducted at the Student’s Instructional Farm, Acharya Narendra Dev University of Agriculture & Technology, Kumarganj, Ayodhya (UP) India. Black scurf disease was prevalent at all the surveyed five districts of Uttar Pradesh. Average disease incidence was 16.33 per cent and 10.53 per cent disease severity were recorded. Twelve germplasm were screened against black scurf disease. Among them C-28 was found Immune (no symptoms), C-48 was resistant, 8 germplasm were found moderately resistant, Kufri Ashok was moderately susceptible, none of genotypes was found Susceptible and Kufri Pukhraj was found highly susceptible. For the management of black scurf of potato, seven various combination practices such as mulching (neem leaf), addition of mushroom spent (organic amendment) in soil, bio-control agent (e.g. Trichoderma harzianum) mixed in soil and tuber treatment at the sowing time, tuber treatment and foliar application of fungicides viz. Carbendazim, Boric acid and tuber treatment with Thifluzamide 15%+ Difenoconazole 20% were evaluated in field conditions. The results clearly indicated that all treatment more or less reduced the black scurf disease incidence, disease severity and increase the germination, plant height, BSDI and yield of the potato. The black scurf disease incidence varies between 4.45 to 13.55 per cent. Among all treatments, lowest (4.45%) disease incidence was recorded in tuber treatment with boric acid 3% + Carbendazim 1% which was found most effective in managing the black scurf disease.