Comparative Effect of Fungicides against Blast Disease of Rice

Keeping in view the importance of rice blast disease, an experiment was conducted in the Laboratory of the department of Plant Pathology & Seed Science, Sylhet Agricultural University, and at the field of regional BADC Seed Production farm, Khadimnagar, Sylhet, Bangladesh, to evaluate see health status of the collected samples and effectiveness of fungicides against the blast disease of rice. Treatments viz T1: Edifen 50 EC (Edifenphos), T2: Karisma 28 SC (Azoxystrobin 20% + Cyproconazole 8%), T3: Nativo 75 WP (Tebuconazole 50% +Trifloxystrobin 25%), T4: Trooper 75WP (Tricyclazole), T5: Stanza 75WP (Imidazole), T6: Amister top (Azoxystobin 20% + Difenoconazole 12.5%), T7: Control (water) were used both in laboratory and field condition. In laboratory, different seed borne fungi, like Aspergillus, Fusarium, Curvularia, Penicillium, Pyricularia, Bipolaris, Alternaria, were detected from the collected seed sample by blotter method. In the field, treatments were applied as foliar sprays for three times with ten days interval. The lowest blast disease incidence (34.0%), lowest severity (31.6%) was found in T2: Karisma 28 SC treated plots, and gave best result in term of yield (6.3 ton/ha) in comparison to other treatments. The results of the present studies suggested that use of Karisma 28 SC is the best choice against rice blast with lowest disease incidence and highest yield.