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Forestry 1958 31(1):63-86; doi:10.1093/forestry/31.1.63
© 1958 by Institute of Chartered Foresters
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THE DISTRIBUTION OF MYCELIA IN EUROPEAN LARCH BARK, IN RELATION TO THE DEVELOPMENT OF CANKER

W. R. DAY

Department of Forestry Oxford

The paper presents fully evidence to support the following conclusions.

  1. The living bark of European larch (Larix decidua Mill.) may be expected to be infected with a microflora which contains both fungi and bacteria and which may sometimes include Dasyscypha willkommii (Hart.) Rehm.
  2. The necrotic areas which constitute cankers can be found to contain a similar flora including Cytospora abietis Sacc., C. curreyi Sacc., and Coniotbyrium fuckelii Sacc. This flora may include D. wilkommii but it is not necessarily the most abundant nor is its presence necessary for the development of larch canker.
  3. Inoculation experiments at Mynydd Ddu, where canker and die-back of branches is severe, with the above species of fungus, show that inoculations stimulate extensions of dead bark. Under different site conditions and in a canker-free plantation at Southmoor, similar inoculations only produced extensions greater than those observed in control treatments, where the trees inoculated had been partially girdled.
  4. A mass of mycelium of the usual species inhabiting living larch bark may, under suitable conditions, have an influence which favours canker extension but some special stimulus, of which the condition of the tree may be an important factor, is needed to enable them to influence the living bark of the host adversely. Much more careful study is needed before conditions which accompany canker development are accurately known.


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