Journal of Agricultural Research (2020), Volume. 7, Issue (2)

Abstract

Experiments arranged in a split plot design with three replications were carried out at farmer’s field of Latpankone village in Nyaunglebin Township, Bago Region during winter season in 2017-2018 and 2018-2019 in order to explore the effects of different sowing dates and mungbean varieties on natural incidence of bean fly. Five sowing dates; S1 sowing on 18th November, S2 sowing on 25th November, S3 sowing on 2nd December (normal sowing date), S4 sowing on 9th December and S5 sowing on 16th December as main plot factor and three mungbean varieties; (Y-1) Yezin-1, (Y-11) Yezin-11 and (Y-14) Yezin-14 as sub plot factor were set up. In both experiments, the highest bean fly infestation was observed in S5. All sowing dates had significant effect on the bean fly infestation percentage, number of adult, larva and pupa per ten sample plants, in both growing seasons. The effect of varieties was found to have the significant difference on percent infestation, pupa per ten plants in 2018-2019 but not in 2017-2018. No significant difference was found on number of adult and number of larva per ten plants on tested varieties in both growing seasons. The highest infestation level was found in S5 and on Yezin-1. Therefore, it is inferred that early sowing resulted in lower incidence than late sowing. The results suggest that for ensuring reduced infestation of bean fly, mungbean in winter season should be sown in mid-November or earlier than the normal sowing date, in the study area.