Author(s):

K Anitha, S Thiruvudainambi, S Harish and R Arun Kumar

Abstract: Tomato is one of the important vegetable crops cultivated worldwide. The diseases of tomato act as a major constrain for its cultivation globally. In the present study, the pathogen associated with collar rot of tomato plants was isolated from different tomato growing areas of Tamil Nadu and confirmed by morphological observation as Sclerotium rolfsii. In vitro efficacy of nine organic amendments and five plant oils were tested against the pathogen. Among the organic amendments, mahua oil cake (10% concentration) recorded the maximum inhibition (80.11%) on the mycelial growth (1.79 cm) of the pathogen under in vitro condition. Among the plant oils, neem oil (0.5% concentration) showed the maximum inhibition (82.67%) on the mycelial growth (1.56 cm) of the pathogen under in vitro condition. The inhibition of organic amendments and plant oils might be due to release of fungitoxic substance in the medium which suppressed the mycelial growth of S. rolfsii.

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