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Picture library: 2004765

Ceratocystis ulmi.  Group of wasps seeking sap on a droughty tree.

Reference: 2004765

Ceratocystis ulmi. Group of wasps seeking sap on a droughty tree.
Date Taken: 15th July 1976

Photographer: J. Dickinson
Copyright: Crown Copyright
Credit line: Forestry Commission / J. Dickinson

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