INCIDENCE AND MANAGEMENT OF RICE YELLOW STEM BORER AND RICE HISPA ON RICE VARIETY BRRI dhan43

Abstract

The experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from April to August, 2016 to incidence and management of rice yellow stem borer and rice hispa on rice variety BRRI dhan43. The experiment comprised of the following control measure as treatment- T1: Marshall 20 EC @ 3.0 ml/L of water at 7 days interval; T2: Malathion 57 EC @ 2.0 ml/L of water at 7 days interval; T3: Diazinon 60 EC @ 3.5 ml/L of water at 7 days interval; T4: Furadan 5G @ 2.5 g/plot at 7 days interval; T5: Sevin 85 SP @ 3.0 g/plot at 7 days interval; T6:Cartap 50 WP @ 3 g/L of water at 7 days interval and T7: Untreated control. Data was recorded on dead heart and white head infestation, incidence of rice hispa and also yield attributes, yield of BRRI dhan43 and found statistically significant differences for different treatment. At 40 and 47 DAT, the lowest dead heart infestation 2.90% and 3.05% recorded in T1 treatment. At 92, 99, 106 and 113 DAT, the lowest white head infestation 3.43%, 6.73%, 4.24% and 4.90% was observed from T1, while the highest white head infestation was recorded from T7. In vegetative stage, at 40, 47, 54 and 61 DAT, the lowest number of rice hispa/2 sweeps 1.00, 1.20, 1.11 and 2.22 was observed from T1, whereas the highest number of rice hispa/2 sweeps was recorded from T7 treatment. In reproductive stage, 92, 99, 106 and 113 DAT, the lowest number of rice hispa/2 sweeps 1.33, 1.33, 0.67 and no rice hispa/2 sweeps was recorded from T1, whereas the highest number was recorded from T7 treatment. The highest yield/hectare (5.67 ton) was recorded from T1, whereas the lowest yield/hectare (3.35 ton) from T7 treatment. The results of economic analysis of rice cultivation revealed that the highest benefit cost ratio (2.28) was estimated for T1 treatment and the lowest (1.03) for T2 treatment under the trial. Among the different control measures, spraying Marshall 20 EC @ 3.0 ml/L of water at 7 days interval was the better for the of rice yellow stem borer and rice hispa on rice variety BRRI dhan43.