Seasonal incidence of insect pests associated with yam bean ecosystem in Dholi, Bihar

During the period of investigation, a number of insect fauna were found to be associated with the yam bean. Among them, pod borer (Maruca vitrata), Leaf hopper (Emposca spp.) and pod sucking bug (Clavigralla gibbosa) were dominant species. The incidence of pod borer and leaf hopper were started during the early growth period where as that of pod sucking bug was stated during the late growth period. It was observed that, temperature had a positive and significant relation with the population of leaf hopper and per cent flower infestation caused by pod borer whereas a negative and significant relation with the population of adult moth, pod sucking bug and per cent pod infestation. The population of adult moth had a positive and significant relation with morning RH whereas the population of leaf hopper had a negative and significant relation with the same. Per cent flower and pod infestation had a negative and significant relation with the evening RH. Rainfall was found to be influenced the activity of adult moth and pod sucking bug.