Author(s):

Kishan Lal, SK Biswas, Deepak Baboo and Shivam Kumar

Abstract: The potato (Solanum tuberosum) is one of the most important vegetable crops in the world, belonging to the family solanaceae and is an important starchy food crop in both sub-tropical and temperate regions. Potato plants are subjected to attack by numerous diseases wherever the crop is grown. Among them, early blight of potato caused by Alternaria solani is of major cause of concern in potato production at present. An experiment was conducted in the Department of Plant Pathology, College of Agriculture, C S AUA & T, and Kanpur. During Ravi season 2015-16 to control. Alternaria solani (Sorauer), causing early blight of potato. Nine different treatments were evaluated in vitro condition. However, in vitro result revealed that the minimum radial growth of mycelium was found in salicylic acid treatment representing the value 1.5, 2.4, 3.6, 5.9, 10.0, 12.2 and 16.0 mm at 1, 2, 3, 4, 5, 6 and 7 days after inoculation, respectively against 7.4, 12.2, 16.3, 21.0, 25.6, 36.0 and 44.9 mm in case of control. Among the treatments, the maximum radial growth of mycelium was recorded in case of copper chloride treatment was showing 1.8, 2.5, 4.6, 8.3, 11.6, 16.2 and 21.2 mm radial growth of mycelium at 1, 2, 3, 4, 5, 6 and 7 days of inoculation. The maximum radial growth was observed in cupper chloride 6.8, 9.2, 11.6, 16.3, 19.1, 25.2 and 32.3. All, the tested inorganic chemicals were statistically significant in reducing the mycelial growth of pathogen as compared with control up to 7 days of inoculation.

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