Pathogenicity of Thekopsora areolata from seed orchards in Finland on Prunus spp. and Picea abies

Pathogenicity of cherry‐spruce rust, Thekopsora areolata, was investigated by inoculations with aeciospores from seven Norway spruce, Picea abies, seed orchards that had suffered from successive severe rust epidemics in the 2000s in Finland. Detached leaves of Prunus spp. were inoculated in the labo...

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Bibliographic Details
Published in:Forest pathology = Journal de pathologie forestière = Zeitschrift für Forstpathologie 2019-12, Vol.49 (6), p.n/a
Main Authors: Kaitera, Juha, Kauppila, Tuomas, Hantula, Jarkko, Stewart, J.
Format: Article
Language:English
Subjects:
Aeciospores
autoechism
cherry‐spruce rust
Cones
Drying agents
Epidemics
Fruits
Laboratories
Leaves
life cycle
Norway spruce
Orchards
Pathogenicity
Pathogens
Picea abies
Pine trees
Populations
Production methods
Prunus
Prunus padus
Rust fungi
Seed orchards
Seedlings
Seeds
Sporulation
Telia
uredinia
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Summary:Pathogenicity of cherry‐spruce rust, Thekopsora areolata, was investigated by inoculations with aeciospores from seven Norway spruce, Picea abies, seed orchards that had suffered from successive severe rust epidemics in the 2000s in Finland. Detached leaves of Prunus spp. were inoculated in the laboratory using aeciospores from cones of various ages. In the greenhouse, live Prunus padus plants were inoculated, and possible autoecism of the rust was tested by inoculations of Picea abies seedlings. Thirty‐five spore sources from the seed orchards formed uredinia on Prunus spp. in the laboratory 2 weeks after incubation, but no telia developed. In the greenhouse, uredinia developed on live P. padus, but no rust symptoms, cankers or sporulation were detected on Picea abies. Thus, no evidence of autoecism was observed among the T. areolata populations and therefore all populations, suggesting all those tested from the Finnish seed orchards were heteroecious.
ISSN:1437-4781
1439-0329
DOI:10.1111/efp.12567