Fungicidal management of alternaria blight of clusterbean [Cyamopsis tetragonoloba (linn.) taub.]

Guar or clusterbean [Cyamopsis tetragonoloba (Linn.) Taub.] crop plant infected by several fungal, bacterial and viral diseases. One of them fungal pathogen Alternaria cyamopsidis Rangaswami and Rao incited blight disease. Different systemic and non systemic fungicides used of in vitro as well in vivo for the management of the pathogen. Different concentrations of fungicides brought about reduction of the mycelial growth of the pathogen and per cent disease reduction in green house. Dithane M-45 was found to best and significantly inhibited the growth completely even at 250 ppm concentration followed by blitox-50 which gave hundred per cent growth inhibition of pathogen at higher concentration i.e. 500 and 1000 ppm. Dithane M-45 and blitox-50 gave 95.00 and 85.84 per cent disease control respectively at 0.2% concentration as well as these fungicides also gave good control of the disease at 0.1%. Other fungicides viz., carbendazim, triadimefon, kitazin and captan were also found good and PEDC being 76.23, 73.86, 72. 31 and 73.08 respectively. Though the fungicides i.e. dithane M-45 and blitox-50 were found best effective for controlling the disease in in vivo and green house conditions.