K.M.E. Nabi, M.K. Hasna, M.I. Khalil, M.M. Haque, J. Farthouse and M.M.H. Tipu
One of the major constraints of black gram production is Powdery mildew (Erysiphe polygoni) disease. This study was an attempt of assess the efficacy of different chemicals against powdery mildew disease. The Experimental design was RCBD with three replication and Binamash-1 variety was planted under natural field conditions. Four chemicals viz. salicylic acid (1g/L), copper shulphate (0.5g/L), chitosan (0.1g/L) and thiovit (2g/L) was evaluated against powdery mildew disease. Those chemicals were applied 3 times with 7days interval after the disease initiation. Disease incidence and percent leaf area infection data was recorded three time after the application of treatments and other agronomic data was recorded after harvest. All the treatments were performed better than control in reducing the incidence of powdery mildew disease and percent leaf area infection. During the experimental period (Khrif -2, 2020), there was no incidence of other fungal foliar disease. Results represent that thiovit @ 2g/L performed best in controlling powdery mildew disease incidence (41%), percent leaf are infection (33%) and highest seed yield (520.57 kg/ha) among the treatments. We can conclude this study that, Thiovit (80% sulphur fungicide @ 2g/L) was best for controlling powdery mildew of black gram among the treatments and it (applied 3 times with 7days interval after the disease initiation) can be used for controlling this disease.
Keywords: Powdery mildew; Black gram; Incidence; Thiovit.