Reference : Pathogenicity and thermotolerance of entomopathogenic fungi for the control of the sc...
Scientific journals : Article
Life sciences : Veterinary medicine & animal health
http://hdl.handle.net/2268/27829
Pathogenicity and thermotolerance of entomopathogenic fungi for the control of the scab mite, Psoroptes ovis.
English
Lekimme, Mireille mailto [Université de Liège - ULg > Département des maladies infectieuses et parasitaires > Parasitologie et pathologie des maladies parasitaires >]
Focant, Charles mailto [Université de Liège - ULg > Département des sciences de la vie > Biologie et génétique moléculaire >]
Farnir, Frédéric mailto [Université de Liège - ULg > Département de productions animales > Biostatistique, économie, sélection animale >]
Mignon, Bernard mailto [Université de Liège - ULg > Département des maladies infectieuses et parasitaires > Parasitologie et pathologie des maladies parasitaires >]
Losson, Bertrand mailto [Université de Liège - ULg > Département des maladies infectieuses et parasitaires > Parasitologie et pathologie des maladies parasitaires >]
2008
Experimental & Applied Acarology
Kluwer Academic Publishers
46
1-4
95-104
Yes (verified by ORBi)
International
0168-8162
1572-9702
Dordrecht
Netherlands
[en] Animals ; Beauveria/pathogenicity ; Female ; Hot Temperature ; Metarhizium/pathogenicity ; Mitosporic Fungi/pathogenicity ; Paecilomyces/pathogenicity ; Pest Control, Biological ; Psoroptidae/microbiology ; Rabbits ; Verticillium/pathogenicity
[en] Psoroptes ovis is responsible for a highly contagious skin condition, both in sheep and cattle. This parasite has a marked economical impact in the sheep and cattle industry. Biological control is considered as a realistic alternative to chemotherapeutic control. Laboratory experiments were carried out to evaluate the pathogenicity and the thermotolerance of twelve isolates of entomopathogenic fungi from four genera (Beauveria Vuillemin, Metarhizium Sorokin, Paecilomyces Bainier and Verticillium Nees). The pathogenicity was evaluated by the survival of P. ovis females after exposure to 10(6) to 10(8) conidia ml(-1) in humidity chambers. Results revealed intra- and interspecies differences. All isolates with the exception of B. bassiana IHEM3558 and V. lecanii MUCL8672 induced 50% mortality within 2 days at the highest concentration. At this concentration the entire mite population became infected with all isolates but B. bassiana IHEM3558; however, only four isolates gave rise to 100% infected cadavers at the lowest concentration. The thermotolerance of each isolate was evaluated by measuring its growth on an artificial medium kept between 25 and 37.5 degrees C. All isolates were able to grow up to 30 degrees C but only two, M. anisopliae IHEM18027 and Paecilomyces farinosus MUCL18885, tolerated temperatures up to 35 degrees C. These two isolates could be considered as good candidates for further use as biopesticide taking into account their virulence and thermotolerance. Other critical factors linked with the implementation of this type of biocontrol in P. ovis infected animals are discussed.
http://hdl.handle.net/2268/27829
10.1007/s10493-008-9171-9

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