RESPONSE OF SELECTED MUNGBEAN VARIETIES AGAINST MUNGBEAN YELLOW MOSAIC VIRUS AND IT’S MANAGEMENT

Abstract

Two split experiments were conducted in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka to evaluate response of selected mungbean varieties against Mungbean Yellow Mosaic virus (MYMV) and management of MYMV in field condition. The 1

st experiment was conducted during the period of July to October, 2019. Three varieties of BARI mungbean namely BARI mung 5, BARI mung 6, BARI mung 7 and one local variety were selected to conduct the experiment and the experiments were designed at Randomized Completely Block Design (RCBD) with three replications. Response against MYMV of selected varieties at 30, 40, 50 and 60 DAS was recorded, the lowest disease incidence (17.80%, 25%, 38.67%, and 48.67%) was recorded in BARI mung 7, whereas the highest diseases incidence (24%, 48.67%, 62% and 74%) was recorded in local variety. On the other hand, the lowest disease severity (5.97%, 11.67%, 26.63%, 31.17%) was recorded in BARI mung 7, whereas the highest disease severity (9.63%, 19.17%, 36.47%, 45.10%) was recorded in local variety. The highest healthy yield (0.91 t/ha) and the lowest infected yield (0.22 t/ha) was recorded in BARI mung 7, whereas the lowest healthy yield (0.59 t/ha) and the highest infected yield (0.35 t/ha) was recorded in local variety. Variation of growth and yield parameters were found in selected varieties at different DAS in field condition. The 2 ii

nd experiment was conducted during the period of July to October, 2020 and local variety was used as variety which showed susceptible to MYMV during 1 st experiment. The experiment was conducted to manage the MYMV in field condition. Five treatments were namely T 1 = (Netting at seedling stage), T 2 = (Yellow sticky trap), T 3 = (Border crop, maize), T 4 = (One spray of imidacloprid), T 5 = (Two spray of imidacloprid) including T 0 = (Control) used in this experiment and one control without any treatment was used. In management study at 30, 40, 50 and 60 DAS, the lowest disease incidence (4.43%, 13.37%, 25.56%, and 33.32%) was recorded in treatment T 5 = (Two spray of imidacloprid), whereas the highest diseases incidence (23%, 41.10%, 53.32% and 66.67%) was recorded in treatment T 0 = (Control). On the contrary, the lowest disease severity (1.33%, 2.63%, 8.33%, 14.17%) was recorded in treatment T 5 = (Two spray of imidacloprid), the highest disease severity (10.83%, 18.67%, 34.17%, 44.73%) was recorded in treatment T 0 = (Control). The highest healthy yield (1 t/ha) and the lowest infected yield (0.08 t/ha) was recorded in treatment T 5 = (Two spray of imidacloprid), whereas the lowest healthy yield (0.41 t/ha) and the highest infected yield (0.27 t/ha) was recorded in treatment T 0 = (Control). The findings of the experiment revealed that BARI mung 7 showed the best performance among all aspect of incidence, severity, growth and yield contributing parameters whereas local variety was susceptible to MYMV disease and two spray of imidacloprid gave better results compared to the other control measures in management study.