Efficiency of Certain Entomopathogenic Bacteria, Fungi with Pesticides for Controlling Spodoptera littoralis

Eleawa, M.; Waked, Dalia A.; Ali, M. A.; Elgohary, Eman M.

doi:10.21608/jppp.2022.114871.1056

Efficiency of Certain Entomopathogenic Bacteria, Fungi with Pesticides for Controlling Spodoptera littoralis

Document Type : Original Article

Authors

Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt

10.21608/jppp.2022.114871.1056

Abstract

This study was conducted to identify the susceptible stages of the cotton leafworm, Spodoptera littoralis to the entomopathogens fungus, Metarhizum anisopliae and bacterium, Pseudomonas aeuriginosa. The mortality percentages recorded after treatment of the 2^nd and 4^th instar larvae of S. littoralis with concentration 1×10⁸spore/ml of M. anisopliae were 84.28 and 75.71% after 5 days of treatment. While, LT₅₀ were 0.81 and 1.93 days for 2^nd and 4^th instar larvae of S. littoralis, respectively. P. aeruginosa concentration 2.3× 10⁸ spore/ml caused mortality 81.42 and 60% and LT₅₀3.87 and 4.51 days for 2^nd and 4^th instar larvae of S. littoralis, respectively. Pupae of S. littoralis were susceptible for both entomopathogens agents. Moreover adults emergence percentage decreased. Combined treatment of pesticides with P. aeruginosa and M. anisopliae proved best action causing higher mortality percentages for larvae compared with using pesticides alone.

Keywords