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The pathogenicity of the blue-stain fungi Leptographiumwingfieldii Morelet and Ophiostomaminus (Hedge.) H. et P. Syd., associated with the pine shoot beetle Tomicuspiniperda (L.), was determined on pruned and unpruned Scots pine (Pinussylvestris L.) trees. Both fungi killed unpruned trees when inoculated in a 60 cm wide band at a density of 800 inoculations/m2, while severely pruned trees were killed by an inoculation density of 400 inoculations/m2. Trees inoculated with L. wingfieldii died sooner after inoculation than trees inoculated with O. minus.

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