Pear trees often suffer from fungal diseases that cause damage to tree bark. Trees under stress from drought, cold weather or wounds are more susceptible to fungal diseases.
Nectria canker is caused by the fungus known as Nectria galligena and occurs in many trees such as pear, birch, elm, dogwood and maple. This disease causes red fruiting bodies on the bark of pear trees. Cytospora canker is another fungal disease that damages bark on infected pear trees, as well as the wood underneath.
A symptom associated with Nectria canker includes orange or red fruiting bodies on tree bark, which produces a ridge of callous tissue. Target shaped cankers appear on tree bark, and small pear trees girdled by canker often die. Cytospora canker produces reddish-brown sap on pear tree bark, which causes damage to bark and underlying wood.
Choosing pear trees with your climate in mind prevents environmental stress. Frequent watering, fertilisation, mulching the tree base and pruning pear trees are all ways to prevent fungal disease, according to the Missouri Botanical Garden.
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