Abstract
The present study evaluated the toxicity of different bacterial strains isolated from the outer surface of adult flies associated with carrions at Al – Mansoureya, Giza Governorate, Egypt against Culex pipiens larvae. 11 different bacterial strains were isolated and identified from the adults of Musca domestica, Chrysomya albiceps and Lucilia sericata. Only five strains caused mortality in C. pipiens larvae more than 50 %. The highest larval mortality was caused by the bacterial strains; Klebsiella oxytoca and Staphylococcus sciuri. The results indicated that entomopathogenic bacterial strains could have the potential for the biological control of mosquitoes.
Highlights
The mosquito vector, Culex pipiens has a wide distribution in Egypt and is the main vector of Rift valley virus (Meagan et al, 1980; Darwish and Hoogastrall,1981), Wuchereria bancrofti (Khalil et al, 1930 and Gad et al, 1996) and the western Nile virus (Pelah et al, 2002).Insecticide applications, highly efficacious against the target species, vector control is facing a threat due to the development of resistance to chemical insecticides resulting in rebounding vectorial capacity (Liu et al, 2006)
The isolated bacterial strains from the external body surface of Musca domestica, Chrysomyaalbiceps and Luciliasericata collected from carrions during the study period from 1/2018 to 12/2018 are given in table (1)
Toxicity of isolated bacterial strains against Culex pipiens larvae: As shown from table (1) and Figure (1) when the different bacterial strains were tested against the 3 rd larval instar of Culex pipiensat conc. of 50 % of the bacterial strains; Klebsiella oxytoca, Proteus vulgaris, Morganella morganii, Lactobacillus delbrueckii and Staphylococcus sciuri, caused larval mortality percent more than 50 %
Summary
Insecticide applications, highly efficacious against the target species, vector control is facing a threat due to the development of resistance to chemical insecticides resulting in rebounding vectorial capacity (Liu et al, 2006). They are responsible for substantial hazards to a variety of non-target organisms and the environment in the form of biomagnification (Gold et al, 2001). Entomopathogenic bacterial strains have enormous potential for biological control of insects (Palma et al, 2014; Peralta and Palma, 2017; Lobo et al, 2018).
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