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Ash and Pear Canker
Clematis Canker
Coral Spot

Common Name



D1 Corneyum Canker on Conifers
C1 Nectria Canker: Malus i) Before infection ii) After infection



Damage Caused

Common serious disease due to fungi and bacteria. Death of plant tissues, resulting in lesions. Occurs on woody plants and result in death of cambium tissue in inner bark. Lesions may heal. Death of cambium may may extend until whole branch dies. Bracket fungus, toadstools, slime may appear on the stems.

Control Methods

Very difficult. Prune affected branches and treat wound with fungicide.

Plants Affected

Ash bacterial canker Pseudonona swoastonai
Ash Canker Nectrina gelligena
Beech Canker Nectria ditissima
Clematis Ascohyta species
Box Canker Volutella buxii
Broom Canker Plexiochaeta setosa

Information Collated by James M. Burton as part of H.N.D. Course at Pencoed Agricultural College.
Chemical Information Correct as of 06:06:97. Always read and follow the instructions when using fungicides.