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SERIAL IN VIVO PASSAGE OF THE ENTOMOPATHOGENIC HYPHOMYCETE TOLYPOCLADIUM CYLINDROSPORUM IN MOSQUITOES

  • Mark S. Goettel (a1)

Extract

Enhancement of virulence in entomogenous fungi has been a particularly neglected area of research (Roberts and Yendol 1971). It is generally believed that virulence increases following successive passage through a host and decreases following repeated subculturing on artificial media (see Aizawa 1971; Roberts and Yendol 1971). Using single-spore isolates (clones) of Beauveria bassiana (Bals.) Vuill., SamšiňSáková and Kálalová (1983) demonstrated spontaneous mutants with increased virulence. Enhancement of virulence using parasitic selection pressures has been accomplished by passage of fungal strains through a host (Daoust and Roberts 1982; references in Ignoffo et al. 1982). Such changes are thought to be due to gradual selection of genotypes.

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Aizawa, K. 1971. Strain improvement and preservation of virulence of pathogens. pp. 655–699 in Burges, H.D., and Hussey, N.W. (Eds.), Microbial Control of Insects and Mites. Academic Press, New York. 861 pp.
Daoust, R.A., and Roberts, D.W.. 1982. Virulence of natural and insect-passaged strains of Metarhizium anisopliae to mosquito larvae. J. Invertebr. Pathol. 40: 107117.
Goettel, M.S. 1987. Studies on microbial control of mosquitoes in central Alberta with emphasis on the hyphomycete Tolypocladium cylindrosporum. Ph. D. thesis, University of Alberta, Edmonton. 198 pp.
Huber, J., and Hughes, P.R.. 1984. Quantitative bioassay in insect pathology. Bull. ent. Soc. Am. 30(3): 3134.
Ignoffo, C.M., McIntosh, A.H., Garcia, C., Krola, M., and Johnson, J.M.. 1982. Effects of successive in vitro passages on the virulence of the entomopathogenic fungus Nomuraea rileyi. Entomophaga 27: 371378.
McLintock, J. 1952. Continuous laboratory rearing of Culiseta inornata (Wilt.) (Diptera: Culicidae). Mosq. News 12: 195201.
Roberts, D.W., and Yendol, W.G.. 1971. Use of fungi for microbial control of insects. pp. 125–147 in Burges, H.D., and Hussey, N.W. (Eds.), Microbial Control of Insects and Mites. Academic Press, New York. 861 pp.
Samšiňáková, A., and Kálalová, S.. 1983. The influence of a single-spore isolate and repeated subculturing on the pathogenicity of conidia of the entomogenous fungus Beauveria bassiana. J. Invertebr. Pathol. 42: 156161.
Soares, G.G. Jr. 1982. Pathogenesis of infection by the hyphomycetous fungus Tolypocladium cylindrosporum Gams in Aedes sierrensis Ludlow and Culex tarsalis Coquillet (Diptera: Culicidae). Entomophaga 27: 283300.

SERIAL IN VIVO PASSAGE OF THE ENTOMOPATHOGENIC HYPHOMYCETE TOLYPOCLADIUM CYLINDROSPORUM IN MOSQUITOES

  • Mark S. Goettel (a1)

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