A review of beech forest pathology

Authors: R.H. Milligan
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1972, Issue N.Z.J.For. 17(2) 1972, pp 201-211, Aug 1972
Publisher: New Zealand Institute of Forestry

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Abstract: Aspects of the anatomy and physiology of Nothofagus spp. apparently relevant to injury to trees by climatic factors, fungi and insects are noted.
A presumably pathogenic fungus is reported spreading from inner to outer sapwood from the vicinity of Platypus tunnels in living trees. It has so far been found in N. menziesii, N. solandri var cliffortioides, N. fusca and N. truncata. Its success as a pathogen appears to depend on its transmission to innermost sapwood of living trees by Platypus.
Observations and experiments suggest that Platypus attack is not restricted to weakened trees. Proximity to sources of emerging brood and to freshly felled or windthrown material appear to be two important factors determining whether or not trees are attacked. Trees of a sufficient diameter to contain an appreciable core of heartwood died following heavy attack; smaller trees which suffered comparable attacks recovered but were left with a core of dead and discoloured sapwood which is here termed pathological wood.
The buprestid, Nascioides enysi, previously considered to be an important factor in mortality of Nothofagus, is found to develop beyond an early larval stage only if the inner phloem, cambium and outermost sapwood lose the capacity to produce gums in response to wounding, a condition characteristic of dead tissue.

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