Vol. 3, Issue 5, Part L (2017)

Abstract
Genus Alternaria belong to deuteromycetes having different species, which are destructive plant pathogen to the families such as Solanaceae, cucurbitaceae, brasicaceae. Tomato crop is from solanaceae grown in study area during rabbi and kharip season having nutritional and economical value. Alternaria solani cause early blight disease of tomato and lose the quality and quantity of crop. The results indicated that Eight isolates of the A. solani were identified and all test isolates showed a wide range of variability and growth of pathogen on different carbon and nitrogen sources in the media. Considering the significance of the disease and important of the crop, present investigation was under taken to determine the best carbon and nitrogen sources in the medium.