Kadir MELAN, Ramazan KEDICI and Gültekin ÜNAL
Plant Protection Central Research Institute, Baðdat Cad. P.O.Box 49, 06172 Yenimahalle Ankara/TURKEY

Studies related to the determination of the egg parasitoids of European corn borer (Ostrinia  nubilalis Hbn.) have been carried out in 1991-1993 in Bolu, Sakarya, Bartýn and Zonguldak provinces.

During the surveys, first and second generation egg batches of the pest were collected. Egg batches were collected from randomly selected maize plants. At least 10 egg batches were collected from each field. All samples were cultured in the laboratory until the adult emergence of the parasitoids completed and so parasitization rate was determined.

Eggs parasitization rates of the pest were determined as 94.74 %  and 51.09 % respectively in Bolu province. Parasitization rates of the eggs of ECB were determined as 97.03 % in Sakarya province. Parasitization rates of the first generation eggs of ECB 20.79 % in Bartýn and 31.58 % in Zonguldak provinces. These rates were 58.53 % in Bartýn and 90.17 % in Zonguldak in the second generation eggs.
It was concluded that natural impact of egg parasitoids was high in Bolu, Sakarya, Bartýn and Zonguldak provinces.

Key words: Ostrinia nubilalis, egg parasitoid, parasitization, Trichogramma evanescens