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Articles by Tuomas Kauppila

Category : Research article

article id 10446, category Research article
Juha Kaitera, Tuomas Kauppila, Jarkko Hantula. (2021). Assessment of the potential of Norway-spruce-seed-orchard associated plants to serve as alternate hosts of Thekopsora areolata. Silva Fennica vol. 55 no. 2 article id 10446. https://doi.org/10.14214/sf.10446
Keywords: Picea abies; cherry-spruce rust; epidemics; rust diseases; Prunus; heteroecism
Highlights: Prunus is the only alternate host of cherry-spruce rust identified in this study; Cherry-spruce rust does not infect plants that belong to common ground vegetation flora in Finnish Norway spruce seed orchards; Spores from different Finnish cherry-spruce rust populations are similarly pathogenic on Prunus; Disease control should be focused only on Prunus in seed orchards.
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The alternate host range of cherry-spruce rust is poorly studied although such information could be important in protecting spruce seed orchards from infections. Pathogenicity of cherry-spruce rust, Thekopsora areolata (Fr.) Magnus, was investigated on potential alternate host species in a greenhouse and in a laboratory in Finland. Five common species of Ericaceae, Vaccinium myrtillus L., V. uliginosum L., V. vitis-idaea L., Empetrum nigrum L. and Arctostaphylos uva-ursi (L.) Spreng, were inoculated in the greenhouse using aeciospores from seven Norway spruce [Picea abies (L.) H. Karst.] seed orchards suffering from T. areolata in 2018. In addition, young detached leaves of Vaccinium spp. and 17 other plant species of ground vegetation from eight Norway spruce seed orchards were inoculated with aeciospores from six seed orchards in the laboratory in 2019. Also, young leaves of Prunus padus L. trees growing within the seed orchards or close to them were inoculated as controls. None of the inoculated leaves of the potential alternate hosts formed uredinia either in the greenhouse or in the laboratory. In contrast, leaves of P. padus from the seed orchards were infected by the six spore sources from six seed orchards and produced uredinia. As T. areolata spores were able to infect only P. padus, but not the other tested species belonging to ground flora, it was concluded that T. areolata disperses only via Prunus spp. in Finnish seed orchards.

  • Kaitera, Natural Resources Institute Finland (Luke), Natural Resources, FI-90570 Oulu, Finland E-mail: juha.kaitera@luke.fi (email)
  • Kauppila, Botanical Gardens, University of Oulu, FI-90014 Oulu, Finland E-mail: tuomas.kauppila@oulu.fi
  • Hantula, Natural Resources Institute Finland (Luke), Natural Resources, FI-00790 Helsinki, Finland E-mail: jarkko.hantula@luke.fi

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