Exploring pest status and successive population growth of Omiodes indicata (Fabricius) in early maturing black gram

Abstract

This investigation was aimed to understand the nature of damage and population growth of the insect pest Omiodes indicata (Fabricius) in black gram crop in random block design having three replications. Any food crop's yield is influenced by pest incidence in addition to soil properties. In multiple investigations, the polyphagous Omiodes indicata (Fabricius) (Lepidoptera: Pyralidae) was identified as a potential pest to various crops. During 2016 and 2017, early-maturing black gram ( Vigna mungo L.) was grown in fallow rice fields in Hajo revenue circle (26.3303 0 N, 91.5148 0 E) in the Kamrup District of Assam. Larvae of Omiodes indicata were counted visually at the experimentation site. This species was discovered in all three plots of the experimental agricultural area. It fed on the green parts of the leaves reducing the chlorophyll content. During the vegetative stage, the population level indicated an increase in its size. Omiodes indicata (larva) was first discovered in the 36 th standard week with a mean population of 0.8/plant and reached its peak in the 39 th standard week with a population of 1.53/plant in 2016. With a mean population of 0.2/plant, the first appearance in 2017 happened during the 37 th standard week. In the same year this pest reached its peak during the 40 th standard week, with a mean population of 1.46 per plant. These findings are significant for both the crop and the local farmers, necessitating managerial attention in order to achieve the projected level of yield.