Pathogenicity of Fusarium oxysporum against the larvae of Culex quinquefasciatus (Say) and Anopheles stephensi (Liston) in laboratory
2010
Prakash, Soam | Singh, Gavendra | Soni, Namita | Sharma, Sweta
The entomopathogenic fungi Fusarium oxysporum are the next generation mosquito controlling agent. F. oxysporum basically contains unique toxin and can be a selectively good agent in tropical countries. We are reporting here the efficacy of the metabolites of F. oxysporum against the larvae of Anopheles stephensi and Culex quinquefasciatus in the laboratory. F. oxysporum was grown on Czapek Dox broth. The bioassays were run at five different concentrations (1.30, 1.60, 1.77, 1.90, and 2.00 ppm). The LC₅₀, LC₉₀, and LC₉₉ values with 95% fiducial limits and probit equations were calculated by probit analysis. The mortality was observed after 24, 48, and 72 h against all instars. The LC₉₀ values in the case of C. quinquefasciatus after 48 h when calculated were 1.85, 1.92, 1.87, and 1.87 ppm, respectively, while LC₉₉ values calculated were 2.24, 2.25, 2.18, and 2.19 ppm. Moreover, after 48 h in the case of A. stephensi, the LC₅₀ values for the first, second, third, and fourth instars were recorded as 1.48, 1.51, 1.71, and 1.50 ppm, respectively. The LC₉₀ values recorded were 1.88, 1.91, 1.93, and 1.89 ppm and LC₉₉ values observed were 2.36, 2.23, 2.26, and 2.21 ppm. The results obtained 24, 48, and 72 h have been compared and it was observed significantly that 48 h after exposure the metabolite has more pathogenicity. The results of the metabolites of F. oxysporum may be considered as a new bio-control agent for vector mosquitoes if the field trial succeeds.
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