The Gardeners Almanac

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Trees

Canker

Overview:

There are two common forms of canker, Fungal Canker and Bacterial Canker.


The fungul type is a common and destructive diseases of Apple trees, and may also affect Pears, Beech, Ash, Poplar, and Sorbus.

If left unattended small branches can be girdled and killed in a single season.


The fungus spreads from the edge of the Canker during the dormant season and produces spores, these spores are then spread by wind and rain into wounds which were possibly made by Woolly Aphids.


What happens is:

View of a typical 'sunken' area


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