Shadi faskha*(1) , Bahaa Al rahban(2), Ghiwa nehmeh(1) , and Basel Darwish(1)
(1). Tartous Agriculture Research Center, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.
(2). Administration of plant protection Research, General Commission for Scientific Agricultural Research (GCSAR), Damascus, Syria.
(*Corresponding author: Shadi Faskha, E-Mail: shadifaskha5@gmail.com, Mob: 0933766201)
Received: 28/09/2023 Accepted:23/01/2024
Abstract:
The lethal effect of the two bioinsecticides azdrachtin (Nimpicidin 1%) and emamectin benzoate (Contact 50 g/kg) on adults and second instar larvae of the citrus mealybug predator Cryptolaemus montrouzieri Mulsant was studied under laboratory conditions.The results showed that direct treatment of azdrachtin and emamectin benzoate on the abdomens of adult insects and secondinstar larvae led to a death rate of 44.96% and 68.92% after 72 hours, respectively.On the other hand, the results of the effect of the dry residues of the two insecticides showed that the azdrachtin caused the death of 16 and 68% of adult insects and secondinstar larvae of the predator after 72 hours of exposure, respectively. While for emamectin benzoate, it was 92 and 84%, respectively. According to the standards of the International Organization for Biological Control (IOBC),azdrachtin came in first class (1- harmless) in terms of the effect of residues on adult insects, while emamectin benzoate came in the third class (3 = moderately harmful) in terms of the effect of residues on insects adults and larvae.
Keywords: azdirachtin, emamectin benzoate, Cryptolaemus montrouzieri, side effect.
Full Paper in Arabic: pdf