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Growth characteristics and pathogenic consequences of predominant entomopathogenic Yukon soil fungi Mortierella alpina and Penicillium expansum,and effectiveness of Met52®,against larvae of the winter tick,Dermacentor albipictus

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Studies in Fungi 2019年第1期4卷 101-110页

作者： Yoder JA Krieger M Oakley M Trotter J Schmelzer P Niksic A Rodell BM Klever LA Department of Biology Wittenberg UniversitySpringfieldOH45501USA Champagne and Aishihik First Nations Haines JunctionYTY0B 1L0CAN Oakley Veterinary Services HainesAK99827USA

Water activity-temperature relationships are reported for Yukon soil-isolated strains of Mortierella alpina and Penicillium expansum that are natural enemies to larvae(infestation stage)of the winter tick Dermacentor *** fungal strains are psychrotrophs,characterized by low thermal growth ranges,consistent with their occurrence in Yukon *** contrast to ***,*** is more temperature sensitive,has a higher requirement,and is more virulent to tick *** and Biological Control Officers should note that for tick population control these *** and *** strains grow and sporulate well under moderate temperature and humid *** experiments used Met52®Bioinsecticide as a positive control,and this is the first study that demonstrates the effectiveness of this commercial product against winter tick larvae.

关键词： Alaska biological control Canada elk tick horse tick moose tick temperature water activity

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Entomopathogenic fungi isolated from Yukon soil against unfed larvae of the winter tick,Dermacentor albipictus

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Studies in Fungi 2019年第1期4卷 123-134页

作者： Dobrotka CJ Krieger M Oakley M Trotter J Rodell BM Stein KL Klever LA Fisher KA Yoder JA Department of Biology Wittenberg UniversitySpringfieldOH45501USA Champagne and Aishihik First Nations Haines JunctionYTY0B 1L0CAN Oakley Veterinary Services HainesAK99827USA

Fungal composition of Yukon soil samples consisted of 29 soil saprobes common to acidified forest,subarctic *** of the fungi identified are psychrotrophs,capable of growth at both 4℃ and 20℃.Of these,a total of 17 fungi were found to be entomopathogenic by winter tick(Dermacentor albipictus)larval bioassays:Aspergillus flavus,Beauveria,namely ***,Mucor,Paecilomyces yielded>~70%larval mortality and the remainder,mostly Mortierella and Penicillium,averaged~40%larval *** where elk(Cervus elaphus canadensis)are observed had an overall greater quantity,and diversity of entomopathogenic soil fungi than sites where elk are not *** diversity of fungi at elk-inhabited sites is likely a product of warmer soil microclimate(hillsides where elk are seen,lose snow earlier than other areas),animal presence,and increased nutrient *** conclude that Yukon soils contain fungi that naturally regulate populations of *** fungi are archived at the Wittenberg University Fungus Collection,Springfield,OH,USA.

关键词： Biological control mycoflora moose tick elk tick horse tick Canada Alaska

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