A report of Fungicide resistance in Alternaria leaf blight pathogen in tomato crop grown in Nandurbar district of Western Maharashtra

Abstract

Ten farmers field of two talukas of Nandurbar district of Western Maharashtra viz., Nandurbar and Shahada were surveyed for Alternaria leaf blight disease of tomato crop. For the management of Alternaria leaf blight disease of tomato, farmers in these area uses fungicide Dithane-M-45, Bavistin, Ridomil, Blitox and Captaf. However, Alternaria leaf blight pathogen had developed resistance to the fungicides Dithane-M-45, Bavistin and Captaf; but it was still susceptible to Blitox and Ridomil. The Captaf resistant isolates had dull white colour coloured mycelial growth. At the bottom line, in Nandurbar district, the farmers may use Ridomil and Blitox for the control of Alternaria leaf blight pathogen.