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Background Pathogenicity of the entomopathogenic fungi (EPF), isolated from soil samples collected from Ordu Province, Turkey, was evaluated on the second-instar larvae of the cotton leaf worm  Spodoptera littoralis  (Boisd.) (Lepidoptera: Noctuidae) under laboratory conditions. Results Firstly, single-concentration response tests were conducted in order to determine the efficacy of the 64 isolates on  S. littoralis  larvae at the concentration of 1 × 10 8  conidia/ml. The five isolates displaying the highest mortality rates in single-concentration response tests, ORU-50, ORM-40, ORP-13, ORP-27 and ORM-48 (which included  Beauveria bassiana, Metarhizium brunneum and Clonostachys rogersoniana ), were subjected to concentration–response tests at the concentrations of 1 × 10 5 –1 × 10 9  conidia/ml. The lowest LC 50  and LC 90  values were recorded at ORP-27 with 1.68 × 10 7  and 4.60 × 10 8  conidia/ml, respectively, followed by ORP-13 and ORM-40. Conclusions Accordingly, it was found that  M. brunneum  isolates were more effective than  B. bassiana  and  C. rogersoniana  against  S. littoralis  larvae. ORP-27, ORP-13 and ORM-40 of  M. brunneum  isolates can be a potential biological control agent used against  S. littoralis  larvae.

Pathogenicity of some local entomopathogenic fungus isolates on the cotton leafworm larvae, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)