PATHOGENICITY OF ENTOMOPATHOGENIC BACTERIUM

Hussein, M. A.; Nouh, G. M.

doi:10.12816/0014492

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	PATHOGENICITY OF ENTOMOPATHOGENIC BACTERIUM "XENORHABDUS NEMATOPHILA" AGAINST GALLERIA MELLONELLA L. AND SPODOPTERA LITTORALIS (BOISD.)
Article 6, Volume 63, Issue 63, June 2015, Page 83-90
Document Type: Original Research Papers
DOI: 10.12816/0014492
View on SCiNiTO
Authors
M. A. Hussein¹; G. M. Nouh²
¹Pests and Plant Protection Department, National Research Centre, Giza, Egypt
²Plant Protection Research Institute, Biological Control Department, Agriculture Research Center, Giza, Egypt
Abstract
Xenorhabdus nematophila (Enterobacteriaceae) is the symbiotic bacterium of an Egyptian strain of entomopathogenic nematode (EPN), Steinernema carpocapsae BA2 (Rhabditidae). In this study, the symbionts bacterium, Xenorhabdu snematophila BA2, was isolated from the haemolymph of the greater wax moth larvae, Galleria mellonella, infected with a native strain of S. carpocapsae (BA2). The efficiency of a fresh isolated bacterium was compared to 2-years old bacterium against the third-instar larvae of G. mellonella L. and cotton leaf worm Spodoptera littoralis (Boisd.) under laboratory conditions. The fresh bacteria caused an average of 51.5 and 54% mortalities to 3^rdinstar larvae of G. mellonella and S. littoralis, respectively. The 2-year old bacteria caused a respective of 48 and 52% mortalities. The mortality percentage increased as the concentration of entomopathogenic bacteria (EPB) increased. The LC₅₀values for X. nematophila reached 1.64x10⁷ and 1.74x10⁷ bacterial cells/ml for fresh and stored S. littoralis, respectively and 1.71x10⁷and 1.88x10⁷ bacterial cells/ml for fresh and stored G. mellonella, respectively.
Keywords
Cotton leaf worm; Entomopathogenic bacterium; Honeycomb moth; pathogenicity; Septicemia; <i>Steinernema carpocapsae</i>; symbiosis
Main Subjects
Animal Ecology and Toxicology; Protozoology and Parasitology


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PATHOGENICITY OF ENTOMOPATHOGENIC BACTERIUM "XENORHABDUS NEMATOPHILA" AGAINST GALLERIA MELLONELLA L. AND SPODOPTERA LITTORALIS (BOISD.)