Efficacy of Less Toxic Phytochemicals to Prevent the Insect Vector of Mungbean Yellow Mosaic Virus (MYMV)

Planting material BARI mungbean-5 and two phytochemicals viz. Imitaf, active ingredient imidacloprid and ACmix, active ingredient chloropyriphos (50%) + Cypermethrin (5%) were used in this experiment. In case of Imitaf, the lowest percent disease incidence (10.12% per plant and 3.51% per plot) and severity (7.21%) were recorded in four times spray (T₄) at 70 DAS. The highest percent disease incidence (36.50% per plant and 11.37% per plot) and severity (23.33%) were recorded in no spray (T₀) at 70 DAS. In case of ACmix, the lowest percent disease incidence (12.21% per plant and 4.21% per plot) and severity (7.53%) were recorded in four times spray (T₄) at 70 DAS. The highest percent disease incidence (36.49% per plant and 11.37% per plot) and severity (36.67%) was recorded in T₀ at 70 DAS. The highest number of flower, no of pod and yield was found in four times spray (T₄) that was higher in Imitaf than ACmix. The highest chlorophyll content was recorded in four times spray (T₄) for Imitaf (49.62 μmol·m^-2·s^-1) and ACmix (56.80 μmol·m^-2·s^-1), and the lowest chlorophyll content was recorded in T₀ for Imitaf (42.01 μmol·m^-2·s^-1) and ACmix (48.34 μmol·m^-2·s^-1). However from the results of this experiment it was revealed that Imitaf gave the better performance to control the insect vector (Whitefly) of MYMV with four times spray.