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Can Norway spruce trees be ‘vaccinated’ against attack by Ips typographus?

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1 A field experiment was carried out to test the hypothesis that treatment of Norway spruce trees with the Ips typographus-transmitted blue-stain fungus Ceratocystis polonica enhances tree resistance to later mass attack by this bark beetle.

2 Twenty-five mature trees were pretreated by inoculating a non-lethal dose of the fungus into the bark, while 18 trees served as untreated controls. Three and a half weeks after treatment a bark beetle attack was initiated by attaching dispensers with I. typographus pheromone to the tree trunks.

3 A significantly larger proportion (67%) of the control trees than of the pretreated trees (36%) were killed by the beetle attack. The result is discussed in relation to recent results regarding defence mechanisms in Norway spruce trees.
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Keywords: Ceratocystis polonica; Ips typographus; Norway spruce; inducible defence; resistance

Document Type: Research Article

Affiliations: Norwegian Forest Research Institute, Høgskoleveien 12, N-1432 Ås, Norway

Publication date: 1999-08-01

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