Trichogrammatid egg parasitoids on Lepidopteran pests in West Sumatera and their parasitization

Species diversity of Trichogrammatid egg parasitoids parasitized lepidopteran pests was studied in West Sumatera. The lepidopteran eggs were collected from rice plants, corns, cabbages, and tomatoes distributed in five regencies with different altitudes. Three species of Trichogrammatid were recorded. Trichogramma japonicumparasitized Schirphopaga incertulasand distributed in all regencies planted ricewith their parasitization ranged between 3.5-27.8%. Trichogramma chilotreaeparasitizing Crocidolomia binotalis was distributed in all regencies planted cabbages with parasitization ranged between 5.3-5.6%. Trichogrammatiodeasp. parasitizing Helicoverpa armigeraattacking corns was only found in Solok with parasitization 18.4%. Only one species of Trichogrammatid was found to parasitize each of lepidopteran eggs. None of egg parasitoid was found to parasitize H. armigeraattacking tomatoes. No difference was shown on the parasitization level of T. japonicumbetween high and low land planted rice.