Population Succession of tomato fruit borer (Helicoverpa armigera) on tomato (Lycopersicon esculentum Mill.) agro-ecosystem in eastern region of U. P.

Abstract

The first appearance of Heliverpa armigera was recorded in 50th and 52nd standard week, but to a low ebb (0.12 and 0.10 larvae per meter row) irrespective of the year of study. The initial population gradually increased and remained confined to vegetative growth but it rapidly increased during fruiting stage and attained its peak in 15th standard week (2nd week of April). Thereafter, the pest population declined. Rainfall and relative humidity were negatively correlated with the pest activity, whereas the maximum and minimum temperature, were positive correlation with relative humidity. Likewise, maximum and minimum temperatures were positively associated in enhancing the pest populations build up. The maximum temperature demonstrated negative impact with relative humidity in the build up of larval population of Helicoverpa armigera.