Vol. 12, Issue 4 (2023)

Author(s):
Bhagyashali V Hudge, T Navya Swetha, Bontha Rajasekar and Dr. Purnima Mishra

Abstract:
Environmental studies on different soil types indicated that significantly highest pre-emergence damping-off with lowest germination was noted in clayey soil while sandy loam and sandy soil responded with significantly least seed rot. In respect of temperature, Pythium ultimum was found to grow in temperature range of 20 ºC to 35 ºC, with maximum growth in the temperature range of 25 ºC to 35 ºC. The maximum sporangial formation was found in temperature range of 25 ºC to 35 ºC. The oospore formation was maximum and was at par 30 ^oC, 35 ºC and 25 ºC. In pH studies (in-vitro), the pathogen Pythium ultimum Trow. could grow in the pH range of 4 to 10, however, significantly highest growth of the pathogen and formation of sporangia and oospore was noted at pH 6.