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Efficacy of entomopathogenic fungi products (i.e. Bio- Power (Beauveria bassiana), Bio-Catch (Lecanicillium lecanii) and Priority ( Paecilomyces fumosoroseus)) against Spodoptera littoralis and Agrotis ipsilon larvae were evaluated under laboratory conditions. Four different concentrations i.e. 0.125x10 9 , 0.25x10 9 , 0.5x10 9 and 1x10 9 spores/ 1000ml D.W of each formulation were used against each pest under investigation and compared with control insects. The results obtained show that Bio- Power was the most effective product followed by Bio-Catch and Priority against S. littoralis 3 rd instar larvae, whereas , the LC50,90 values were 0.2x10 9 and 1.5x10 9 , 0.22x10 9 and 4.6x10 9 , 0.44x10 9 and 4.7x10 9 , respectively. While in case of A. ipsilon, Priority was the most potent product followed by Bio- Power and BioCatch, whereas, the LC50,90 values were 0.14x10 9 and 0.6x10 9 , 0.2x10 9 and 0.9x10 9 , 0.4x10 9 and 9.7x10 9 , respectively. Also, The results obtained show that percentage mortalities of treated third instar larvae of S. littoralis with Bio- Power, Bio-Catch and Priority were 87.5,72.5 and 67.5 %, respectively ,within 6.3,8.2 and 7.4 days at the highest concentration used (1x10 9 spores). However, The treated third instar larvae of A. ipsilon with Priority, Bio- Power and Bio-Catch achieved 100, 90.0 and 62.5 % mortality, respectively, within 5.3, 7.1and 3.9 days at concentration of 1x10 9 spores. The different formulations had delayed effects, the percentage of pupae and adults emerged were significantly decreased with an increase in concentrations.

Laboratory bioassay of some entomopathogenic fungi on Spodoptera littoralis (Boisd.) and Agrotis ipsilon (Hufn.) larvae (Lepidoptera: Noctuidae).