1Udai Pratap Autonomous College, Dept. Botany, Bhojubir, Varanasi, Uttar Pradesh – 221003, India
2Indian Institute of Vegetable Research, Post bag No.1,P.O. Jakhini (Shahansapur), Varanasi, Uttar Pradesh-221305, India
*Corresponding author: sujoyta@gmail.com
Online published on 18 May, 2015.
Early blight of tomato is one of the most destructive diseases caused by Alternaria solani causing considerable loss to quality and quantity of fruits. To avoid chemical fungicides in the management of this menace, soil borne rhizospheric organisms were isolated and evaluated against the pathogen. Different antagonists i.e Aspergillus sp. Trichoderma sp. Pseudomonas sp. and Bacillus sp. were used against most virulent isolates of A. solani under in vitro and in vivo conditions. Maximum in vitro inhibition of mycelial growth of Alternaria solani was observed in case of Trichoderma sp. (87.69%) followed by Aspergillus sp. (84.23%) as compared to control. Under glass house conditions Trichoderma sp. exhibited a similar efficacy with a percent disease control ranging from 82.6–91.3.
Six bio-antagonists T-8, T-17, F-4, T-2, PS-4 and BAS-2 were antagonistic to tomato early blight pathogen.
T-8 recorded the highest inhibition under in vitro conditions as well as in glass house conditions
Alternaria solani, screening, evaluation, antagonists
