BIOLOGICAL CHARACTERISTICS AND INVESTIGATION OF THE EFFECTS OF SOME INSECTICIDES Trichogramma chilonis (HYM.: TRICHOGRAMMATIDAE) PARASITING POMELO FRUIT BORER CITRIPESTRIS SAGITTIFERELLA IN MEKONG DELTA OF VIET NAM

Obtained investigation on pomelo orchards in Mekong delta area showed that there were two species of (Trichogramma chilonis and Trichogramma sp.) a parasite living on eggs of citrus fruit borer Citripestris sagittiferella Moore (Lepidoptera: Pyralidae). These egg parasitoids, especially Trichogramma chilonis species, were common in the south of Viet Nam. Adults had the size, width (0,24±0,02 mm) and length (0,1±0,01 mm). With lifecycle of egg stage was 23,04±2,22 hours, larva stage 45,12±5,18 hours and adult stage 4,27±0,78 days. The effects of some insecticide active ingredient on Trichogramma chilonis were investigated under laboratory conditions. Testing results showed that all kinds of investigated active ingredients had adverse effects to T. chilonis. They caused the death rate of adult T. chilonis parasitoids to 100% within 12 hours after contacting with insecticides. Among testing ative ingredients, clothianidin gave high toxicity and caused rapidly death to parasitoids within one hour of contacting. Meanwhile, Petroleum Spray Oil’s gave the lowest effect to parasitoids. The effects of insecticides on both the parasitic capability and the ratio of emerging of T. chilonis showed that abamectin and emamectin were less effect on parasitoid in comparison with the other active ingredients.