دراسة قدرة الطفيل (Ascogaster Quadridentata (Hymenoptera : Braconidae العدو الحيوي لفراشة ثمار التفاح Cydia Pomonella .L المنتج مخبرياً على التأقلم في الظروف الحقلية

الملخص EN

All the experiments were carried out in apple orchards in Al-Zabadani and Sargaih provinces located near Damascus (Syria) during the period between 312010/12/22-3/.

Parasitoid Ascogaster quadridentata Wwere released in apple orchards at 5, 10, 15, 30 and 60.

m.

from Delta Traps contain eggs and scales of its host codling moth Cydia pomonella L, to study the flight ability of wasps in the field.

The results showed that the percentage of caught wasps were 17.3, 10.2, 7.3, 2.8 and 1.3% respectively.

A large number of wasps were also released weekly in three fields (14 times) during 2010, and the over wintering larvae of codling moth were collected by corrugated paper traps at the end of November.

The results showed that the percentage of parasitism in the larvae were 2.9, 22 and 28.7% in the control orchard, orchard treated tow times with pesticide and neglected orchard respectively.

The results of these experiments have showed that a small number of wasps were able to fly to 60 m, thus it is advisable to release the wasps at 5- 15 m.

distance.

High percentage of parasitism of codling moth larvae indicates that the parasite succeeded and adapted in the study area.

The laboratory tests have shown that fluorescent dye used for coloring of wasps which added at rate of 2mg/100 wasps, insignificantly affected their longevity (22 days).

Treating the eggs of host by four ways: control, free scales eggs by sweeping, free scale eggs by washing and eggs provided with scales after washing, showed that the percentage of parasitism of the eggs were 91.3, 56.6, 11.8 and 33.7% respectively.

This refers to the role of scales and eggs of the host to attract the parasite and determine its place.