Shadi Faskha1* and Bahaa Alrahban2
1 Tartous Agricultural Research Center, General Commission for Scientific Agricultural Research (GCSAR), Syria.
2 Plant Protection Research Administration, General Commission for Scientific Agricultural Research (GCSAR), Syria.
(*Corresponding author: Shadi Faskha, Email: Shadifaskha5@gmail.com )
Received: 17/ 5/ 2025 Accepted: 29/ 6/ 2025
Abstract
Effect of bio-inseticides: Azadrachtin, Emamectin benzoate, Spinosad and the pathogenic fungus Beauveria bassiana with a positive control, insecticide Chlorpyrifos was studied on the rate emergence of Trichogramma principium adults and their longevity after emergence when treating the eggs of the host Sitotroga cerealella parasitized in the pupal stage, under conditions of the Agricultural Scientific Research Center laboratory in Tartous during May 2023. The results showed that there were significant differences between insecticides in the rate of reducing the emergence of parasitoid adults compared to the control (distilled water), where chlorpyrifos achieved the highest reduction rate (99.52%), followed by spinosad with a reduction rate (82.80%) while the insecticides emamectin benzoate and azadrachtine reduced the emergence to (63.69, 51.50%) respectively. On the other hand, the results of the effect of insecticides on the longevity of parasitoid adults after their emergence showed that the chlorpyrifos and spinosad achieved the shortest period (0.20 and 0.42 days) respectively. The pathogenic fungus B. bassiana gave the longest survival period (8.18 days) compared to other insecticides, and the control outperformed all treatments, recording the longevity of (10.78) days.
Keywords: azadirachtin, emamectin benzoate, spinosad, Trichogramma principium, Beauveria bassiana, chlorpyrifos.
Full paper in Arabic: PDF