Isolation and in vitro evaluation of different botanicals on mycelia growth of Alternaria alternata (Fr.) Keissler causing leaf spot of brinjal

Abstract

Brinjal is subjected to several diseases at all the stages of crop. Among all the diseases infecting brinjal, the leaf spot of brinjal is the most severe threat among all the vegetable crops. This disease is incited by the number of pathogens but the major causal organism is Alternaria alternata. Four plant extracts (Turmeric, Neem, Tulasi and Alovera) were evaluated against Alternaria alternate under in vitro conditions by using the poison food technique method at different concentration levels of (2.5%, 5%, 7.5%). Among the four plant extracts tulasi and turmeric showed most efficacious and successful in inhibiting the mycelial growth of Alternaria alternate, where as alovera showed lowest inhibition of pathogen causing leaf spot of brinjal.