Vol. 11, Issue 11 (2022)

Tomato one of the leading vegetable crop in India and all over the world. It affects by pathogen Alternaria solani in form of early blight of potato which is a potential disease of tomato growing areas. The resistant sources against this phytopathogen were also less thus late blight also found to be most destructive diseases of tomato. In this paper we have discussed the effect of temperature and pH on the growth of Alternaria solani. Effect of different temperature on growth of Alternaria solani showed that temperature range the highest growth of the A. solani isolate i.e. AB2 with 89.4 mm were found in the temperature 25 °C while the lowest growth of fungi were found at the temperature 45 °C i.e. 28.25 mm in AB17. Effect of different pH on growth of Alternaria solani showed that The average highest growth of Alternaria solani 86.44 mm were observed in the pH of 7 while the lowest fungal growth i.e. 26.52 mm were observed at 10 pH.