Effect of Release Time on Egg Parasitoid Trichogramma Chilonis (ISHII) Against Heliothis Armigera (HBN.)

An experiment was conducted to determine the effect of natural enemies on effect of release time of egg parasitoid Trichogramma chilonis (Ishii) against H. armigera as an IPM strategy for pest control was carried out at farmer field Hanif Jamali Farm near Tajpur, Tando Allahyar from February-May, 2012. The result showed that maximum pre-treatment population of H. armigera appeared on tomato fruits in 1st week of February and increased gradually reached to its peak (6.88/ plant) in May in control plot was higher than all the treated released plots whereas minimum population was recorded (5.17±1.13/plant) in 7 days interval. The result further indicated that maximum mean population reduction (1.29±0.28%) was recorded in 7 days interval followed by (2.01±0.35%) and (2.52±0.39%) in 21 days interval. In treated released plots minimum population per plant were recorded (5.22) as compared to control plot with per plant. Furthermore, the study also indicated that maximum monthly reduction of H.armigera population was observed (5.17±1.13%) in 7