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.

Abstract | Full text in HTML | Full text in PDF | Author Info

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
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

article id 179, category Research article

Henna Vartiamäki, Jarkko Hantula, Antti Uotila. (2009). Susceptibility of silver birch pruning wounds to infection by white-rot fungus (Chondrostereum purpureum), a potential bioherbicide. Silva Fennica vol. 43 no. 4 article id 179. https://doi.org/10.14214/sf.179

Keywords: birch; vegetation management; biological control; fungal decay; pruning

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We artificially inoculated pruning wounds of silver birch (Betula pendula Roth) to study seasonal variation in their vulnerability to infection by the fungal decomposer Chondrostereum purpureum (Pers. ex Fr.) Pouzar. This information is critical to the assessment of incidental infection risks in areas where C. purpureum may be used as a bioherbicide. On seven monthly occasions between April and October 2005, 30 birch trees were pruned to yield a total of 210 experimental trees. On each occasion, 10 trees were inoculated immediately with C. purpureum mycelium, 10 were inoculated with blank inoculum and 10 were only pruned. In the summer of 2007, a survey of 129 experimental trees showed that pruning wounds were most susceptible to infection during May. Treatment with C. purpureum at other times during the growing season also increased the extent of discoloration or decay but the effect was considerably less.

Vartiamäki, Finnish Forest Research Institute, Vantaa Research Unit, P.O. Box 18, FI-01301 Vantaa, Finland E-mail: henna.vartiamaki@metla.fi
Hantula, Finnish Forest Research Institute, Vantaa Research Unit, P.O. Box 18, FI-01301 Vantaa, Finland E-mail: jh@nn.fi
Uotila, University of Helsinki, Hyytiälä Forestry Field Station, Hyytiäläntie 124, FI-35500 Korkeakoski, Finland E-mail: au@nn.fi

article id 500, category Research article

Jarkko Hantula, Eeva Vainio. (2003). Specific primers for the differentiation of Heterobasidion annosum (s.str.) and H. parviporum infected stumps in northern Europe. Silva Fennica vol. 37 no. 2 article id 500. https://doi.org/10.14214/sf.500

Keywords: IS group S; IS group P; molecular identification; root and butt rot

Abstract | View details | Full text in PDF | Author Info

Two separate amplification products from random amplified microsatellite fingerprints of Heterobasidion annosum (s.str.) and H. parviporum were converted to specific markers. The markers were tested to be species specific and combined to a single PCR-reaction, which allowed the detection and identification of the two fungi directly from wood samples.

Hantula, Finnish Forest Research Institute. Fax +358 9 8570 5531 E-mail: jarkko.hantula@metla.fi
Vainio, Finnish Forest Research Institute. Fax +358 9 8570 5531 E-mail: ev@nn.fi

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