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Background As different biogeographic strains and isolates of entomopathogenic fungi vary in their genetic, enzymatic and pathogenic characteristics, this study assessed the virulence of 2 indigenous strains of  Beauveria bassiana  (Balsam) Vuillemin and  Metarhizium anisopliae  (Metschn.) Sorokin (Ascomycota, Hypocreales: Clavicipitaceae), isolated from naturally infected insect cadavers, against the 3rd instar nymphs of  Myzus persicae  (Sulzer) (Hemiptera: Aphididae) and 3 rd  instar larvae of  Spodoptera frugiperda  (J.E. Smith) (Lepidoptera: Noctuidae) using leaf-dip and larval-dip methods, respectively. Results Both fungal isolates exhibited considerable pathogenicity against  M. persicae  and  S. frugiperda . Mortality in all bioassays was conidial concentration and exposure time dependent and increased significantly along with both factors ( R  2  = 0.86–0.99 for  B. bassiana  and 0.82–0.94 for  M. anisopliae ). Moreover,  M. anisopliae  isolate appeared more virulent to  S. frugiperda  larvae than  B. bassiana  isolate, while the later fungal isolate was more lethal to  M. persicae  nymphs than the former one. At the highest conidial concentration (1.0 × 10 9  conidia/ml),  M. anisopliae  caused maximum mean mortality of  S. frugiperda  (88%) and  M. persicae  (65%) and  B. bassiana  exhibited maximum mean mortality of  S. frugiperda  (76%) and  M. persicae  (94%). Moreover, probit regression analyses showed LT 50  values for  M. persicae  of 4.57 and 6.86 days at 1.0 × 10 9  conidia/ml for the isolates of  B. bassiana  and  M. anisopliae , respectively, while LC 50  values were 7.75 × 10 6  and 8.70 × 10 7  conidia/ml after 10th day of application, for the isolates of  B. bassiana  and  M. anisopliae , respectively, against  M. persicae . Similarly, LT 50  values for  S. frugiperda  were 7.75 and 7.03 days for 1.0 × 10 9  conidia/ml concentration and LC 50  values were 2.84 × 10 7  and 8.84 × 10 5  conidia/ml at 10th day data for the isolates of  B. bassiana  and  M. anisopliae , respectively. Conclusion Overall study results demonstrated the effectiveness of  B. bassiana  and  M. anisopliae  against  M. persicae  and  S. frugiperda , respectively. However, field evaluations of these indigenously isolated promising fungal strains against these insect pests.

egyptian journal of biological pest control

Isolation, identification and virulence of indigenous entomopathogenic fungal strains against the peach-potato aphid, Myzus persicae Sulzer (Hemiptera: Aphididae), and the fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)