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Picture library: 2004216

Unexplained perennial basal stem canker on quercus robur. Notice ridges of callus tissue which have themselves been killed

Reference: 2004216

Unexplained perennial basal stem canker on quercus robur. Notice ridges of callus tissue which have themselves been killed
Date Taken: 3rd December 1983

Photographer: Robert Strouts
Copyright: Crown Copyright
Credit line: Forestry Commission / Robert Strouts

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