Control of insects with Entomopathogenic bacterium Xenorhabdus nematophila and its toxic secretions
2008
Mahar, A.N. (The University of Reading, Earley Gate (UK). Dept. of Agriculture) | Jan, N.D. (The University of Reading, Earley Gate (UK). Dept. of Agriculture) | Mahar, G.M. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Entomology) | Mahar, A.Q. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Entomology)
Direct application of either cell solutions or cell free-filtrates from symbiotic bacterium Xenorhabdus nematophila can control insects on leaves and in soils. Larvae of the beet armyworm (Spodoptera exigua), diamondback moth (Plutella xylostella), black vine weevil (Otiorhynchus sulcatus) and nymphs of desert locust (Schistocerca gregaria) were killed by both cell treatments and cell-free filtrates, which were equally effective. Therefore, the toxin present in both treatments was responsible for the lethal effects. Cells of X. nematophila recovered from the haemocoele of all treated insects, indicating that cells were able to move from the external environment and enter insects in the absence of the nematode vector. The toxicity of cell suspensions and cell-free filtrates, as assessed by Galleria mellonella mortality, persisted for up to 5 months in soil indicting that soil treatments with either cells or cell-free filtrates controlled O. sulcatus in potted plants.
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