الفهرس 
Introduction
Ecological studiesOnly 14 pages are availabe for public view
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Abstract
The present study was carried out in Seidy Salem region, Kafr El-Sheikh
governorate for three successive seasons from 2004 to 2007. The experimental area was about ¼ fed. Planted with broad bean, chickpea and lentil in the third week of November as a winter host plants and cowpea, kidney bean and tomatoes in the third week of May as a summer host plants.
To estimate the seasonal activity of L. trifolii parasitoids, sampling took
place as soon as the newly vegetative growth was completely appeared in the experimental area and continued weekly until harvest. Host plant preference, superparasitism and effect of temperature and relative humidity for the parasitoids were also studied. Finally some biological studies on the main parasitoids were carried out in the laboratory. The obtained results could be summarized as follows:-
I. Field studies:
1. The ectoparasitoid diglyphus isaea (walker)
a. Seasonal activity
- On winter crops
The larval parasitoid D. isaea recorded three peaks of abundance on broad bean, lentil and chickpea in the first season 2004/05, while it recorded three peaks on broad bean and two peaks on lentil and chickpea in the second season 2005/06 and reached four peaks on broad bean and three peaks on lentil and chickpea in the third season 2006/07. On the other hand, the monthly average numbers of the parasitoid D. isaea were (85.7±46.6, 92.8±54.5 and 72.6±33.9 individuals/100 mined leaflets) on broad bean, (16.0±12.7, 9.2 ±5.3 and 11.5 ±5.5 individuals/100 mined leaflets) on lentil and (4.2 ± 3.2, 3.7 ± 2.3 and 3.5 ± 3.2 individuals/100 mined leaflets) on chickpea during the three winter seasons, respectively.