Apple tree with growths on the trunk

How does tree canker develop?

The one that causes tree cancer Mushroom needs one injury to the bark, to the apple tree to penetrate These can be mechanical interventions, as in the case of tree pruning occur, but also damage caused by insects, hail or frost cracks.

Symptoms in the form of small, pale, sunken spots on the surface of the bark appear just two to three weeks after the initial infection. These dry out and turn dark. As the fungal disease progresses, the bark bursts open. In the following year you can discover the red fruiting bodies here.

Why do the characteristic growths form on the trunk?

The tree tries those caused by the fungal infection injuries with bark tissue to close. However, this does not eliminate the fungus and can continue to spread.

There is a reduced supply of water and nutrients. The apple tree withers in some places and only produces small fruits. In addition, calyx or storage rot often occurs.

How to prevent growths on the trunk?

Particularly important is the professional execution of pruning, since the wounds represent an open entry point for the fungus:

• Always cut the apple tree in dry weather. This almost completely prevents the spores from spreading.
• Try to avoid all mechanical injuries. These often occur as a result of incorrectly attaching tree stakes, crossing branches or bumping into the lawnmower, for example.
• Protect that Apple by a white coat from frost cracks.

How can fruit tree cancer be combated?

Check the apple tree regularly so that you can infection with Neonectria ditissima recognize early.

• The fungus cannot be killed by approved spraying.
• For this reason, cut back smaller areas of infection and affected branches deep into the healthy wood.
• You can cut or mill out wounds on the trunk.
• Dispose of all clippings with household waste.

The same applies to combating: Carry out these care measures in dry weather.

Tip

Cutting tools should always be very clean

Tools that still have traces of other plants on them promote the spread of disease. Therefore, wash off coarse dirt thoroughly and then disinfect the garden tools with spirit or vinegar essence.