عوامل الموت الطبيعي لآسروع الصنوبر الجرار جادوب أعشاش الصنوبر (Lepidoptera : Thaumetopoei'dae)‎ Thaumetopoea pityocampa SCHIFF في مرحلة البيض بالمغرب

Abstract EN

The forest caterpillar : thaumetopoea pitycampa schiff., is the most significant defoliator of cedar and pine forest in morocco.

death factors, the impact of parasites at egg stage and the effect of treatment on the eggs parasites were studied in 1990 and 1991 in the whole pine forests of morocco.

this study showed that the parasitism effect at egg stage is the main factor in reducing the population of caterpillar and revealed also that treatements with substance produced out of bacillus thuringiensis and dunilin are with no direct effect on the eggs parasites of the 7.

pityocampa.

four species of parasites on eggs belonging to hymenoptera are identified.