Seasonal Incidence of Insect Pest and Natural Enemies on Onion Agro Ecosystem at Tandojam, Pakistan

Abstract

The present study on agro ecosystem of Onion crop was carried in order to know the seasonal incidence of insect pest and natural enemies at Tando Jam, District Hyderabad, Sindh, Pakistan during kharif season 2011. Healthy onion seedlings were transplanted on ridges in natural conditions. The crop was observed on weekly basis to find the number of insect pest, natural enemies and plant growth,. Overall Thrips, army worm, Onion maggot and Cricket were observed infesting the crop at different temperature, relative humidity, growth period of onion throughout the cropping season. On occurrence of insect pests, natural enemies were found on crop to control the pest population in natural agro ecosystem. Over the onion cropping season natural enemies were predatory the pests so the plant growth and yield were not affected by pest. After the harvest of crop 25 onion bulbs were weighted to find the average.

Keywords: Incidence, pest and natural enemies, Onion, Agro Ecosystem