DISTRIBUTION OF WIDTEFLY, Bemisia tabaci Gennadius ON MUNGBEAN IN MAJOR MUNGBEAN GROWING REGIONS OF BANGLADESHI

Abstract

The study was conducted in the three mungbean growing locations/regions of Bangladesh viz., Bansal. Jessore and Gazipur during March 2005 to March 2006 to explore the distribution of whitefly. Bamisin (abaci Genn. and the incidence of Mungbean yel/ow mosaic virus (MYMV) disease infection in mungbean (Vigna radiata) as well to study the climatic factor(s) as the basis for regulating them. The incidence of whitefly and MYMV infection were the maximum in Barisal (253.7 adults and 82.90 nymphs/20 plants, and 37.33% leaves and 57.20% plants infection, respectively) and the lowest in Jessore (39.0 adults and 10. I 9 nymphs120 plants, and 18.20% leaves & 16.50% plants infection, respectively). The rate of MYMV infection in leaves and plants were positively correlated with the incidence of both whitefly adult and nymph. The climatic factors were attributed to the variations of whitefly incidence as well as performance of mungbean in locations. Among three locations, macroclimatic temperature (3 I .5°C), RH (84.44%) and rainfall (1.47 mm) as well as microclimatic temperature (25.6°C) and RH (77.8%) within crop canopy of mungbean were the highest in Jessore, which were detrimental to the incidence of whitefly. Conversely, macroclimatic temperature (28.4°q and RH (76.44%); microclirnatic temperature (21.53°(') and RH (73.73%) were the lowest in Barisal, which played as the favorable factors lor whitefly population. Both macro and microclirnatic temperature. RH and rainfall were negatively correlated to the incidence of whitefly. Accordingly, the incidence of whitefly and MYMV infection were the maximum in Barisal and minimum in Jessore and intermediate in Gazipur. Thus yield attributes were better and higher yield (1160.6 kg/ha) was obtained in Jessore, which was followed by Barisal (866.7 kg/ha), while the yield was minimum (414.7 kg/ha) in Gazipur.