Vol. 12, Issue 11 (2023)

Author(s):
Aradhna Sagwal, Satish Kumar, Kushal Raj, Pooja Yadav and Preeti Vashisht

Abstract:
Tomato (Solanum lycopersicum L.).) grown widely throughout the world under various agro-climatic conditions. The Root rot in tomato caused by Rhizoctonia solani has been considered as most devastating disease in monocropping areas of Haryana. Rhizoctonia solani causes pre-emergence and post-emergence plant mortality in seedlings and black lesions in root. The Pathogenicity level of R. solani was studied during 2018-19 at different mycelial inoculum levels i.e. 100, 200, 500, 1000 and 2000 mg/kg soil on tomato cv. Hisar Arun (Selection 7) under screenhouse conditions. The maximum pre-emergence plant mortality of 30 per cent and maximum post- emergence mortality of 40 per cent was observed when mycelial suspension of 2000 mg/kg soil was used followed by total mortality of 43.4 per cent at an inoculum level of 1000 mg/kg soil. The minimum plant mortality of 17.0 per cent was observed at 100 mg/kg soil inoculum of R. solani, thus found that total plant mortality was directly proportional to inoculum levels of the fungal pathogen and total mortality gradually increases with increase in inoculum levels of pathogen from 0.1 to 2.0 g/kg soil.