Abstract
A field experiment was conducted at the research field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka during the period from April to November, 2011 to manage the sucking insects of mungbean and its impact on incidence of mosaic disease. The mungbean variety, BARI mung 4 was grown in the field and seven treatments viz., Ripcord 10EC, Actara 25WG, Marshal 20EC, Malathion 57EC, Neem oil, Tamarind extract and an untreated control were tested against the sucking pests. Whitefly, jassid, aphid and leaf hooper were found as sucking insects and whitefly was the most abundant in mungbean field. The lowest population of aphid, jassid, whitefly and leafhopper (3.85, 1.80, 4.90, 1.35 plant-1 respectively at vegetative stage & 2.80, 1.25, 3.80, 0.55 plant-1 respectively at reproductive stage) was found in marshal 20EC treated plots which showed maximum percent reduction of aphid, jassid, whitefly and leafhoppers over control (63.17%, 55.70%, 57.33% & 64.76% respectively at vegetative stage & 66.65%, 65.01%, 58.89% & 75.79% respectively at reproductive stage). The number of mosaic infected plant was found lowest (6.75/plot at before flowering and 4.75/plot at after flowering stage) in the same treatment. Marshal also produced the maximum plant height (90.25 cm), dry weight of plant (62.85 g), number of pods plant-1 (26.25), length of pod (7.19cm), number of seeds pod-1 (8.25), 1000-seed weight (35.50 g) and gave highest yield (566.50 g plot-1) of mungbean followed by ripcord 10 EC . Neem oil showed the intermediate results considering all the parameters. The results of present study indicate that the marshal 20EC was the most effective treatment against sucking insects and mosaic infection.
