Pests and Diseases Viewer

Apple and pear Canker



P_nectriacanker2

Apple and pear Canker

Usually appear in

All Seasons


Back to Pests and Diseases


Caused By:-     The Fungus Nectria galligena

Description

Areas of the bark sinks inwards. It is most often associated with a wound or bud. The bark changes colour and shrinks and cracks forming concentric rings of bark which easily peels off. As the fungud grows around the stems the upper branches and leaves die back. In summer raised white fungal pustules form on the canker and in winter red fruiting bodies develop. Fruits can often rot prematurely. Other trees like Poplars, beeches, sorbus, willow and horthorns can also be infected.
See these other Cankers Bacterial, Bleeding, Canker, Cytospora, European, Horse Chestnut Bleeding, Mulberry, Parsnip, Pear and Apple, Phomopsis, Poplar Bacterial, Rose Stem and Dieback, Willow Black.


Control

This fungus spreads mainly by wind blowing the spores in spring. Therefore winter tar oil wash will help. When it has taken hold the affected areas must be cut out and the wound treated with various wound paints. Some sprays are effective on the fungus and some varieties of apples and pears are more susceptible to the fungus.



Back to top