Population dynamics of sucking pests, natural enemies, and the incidence of yellow mosaic disease on Vigna radiata (L.) Wilczek in relation to weather factors

The investigation on population dynamics of sucking pests, their natural enemies, and the per cent disease incidence (PDI) of mung bean yellow mosaic disease (YMD) on Vigna radiata was conducted. During the harvest of the crop, the population of Aphis craccivora, Empoasca kerri, ladybird beetle, and the PDI of YMD was the highest on the 17th Standard meteorolo gical week (SMW). In contrast, the population of Bemisia tabaci was at its peak on the 15th SMW. The minimum temperature had highly significant positive correlation with the population of A. craccivora, E. kerri, B. tabaci, ladybird beetle, and the PDI of YMD. Moreover, there was a significant positive correlation between wind velocity and the population of ladybird beetles. Furthermore, a significant positive correlation was found between the PDI of YMD and the population of B. tabaci.