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Effects of pruning young Scots pines on host vigour and susceptibility to Leptographium wingfieldii and Ophiostoma minus, two blue‐stain fungi associated with Tomicus piniperda
Author(s) -
Långström B.,
Solheim H.,
Hellqvist C.,
Gref R.
Publication year - 1993
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1993.tb00820.x
Subject(s) - phloem , inoculation , biology , fungus , bark (sound) , host (biology) , botany , ophiostoma , scots pine , pruning , horticulture , twig , mycelium , pinus <genus> , ecology
In a field experiment in central Sweden, the vigour of 25‐yr‐old Scots pines was manipulated by pruning, prior to inoculation with Leptographium wingfieldii and Ophiostoma minus , two blue‐stain fungi associated with Tomicus piniperda . Our main purpose was to correlate fungus invasion and host defence reactions with host vigour. Both fungi invaded the inner bark and the sapwood at the points of inoculation. L. wingfieldii caused larger lesions in the bark, but O. minus tended to grow faster in the sapwood. The flow of primary resin was related to tree vigour, whereas carbohydrates present in needles and stem phloem were not. Lesion formation and the content or composition of resin acids in lesions did not differ between fungi or pruning treatments.