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Fire Blight on Pear Trees

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Fire Blight on Pear Trees

Fire Blight on Pear Trees. The pear tree is part of the genus Pyrus. It is native to Europe and southern Asia. A destructive disease called fire blight can damage pear trees. Preventative measures can reduce the risk of infection.

The pear tree is part of the genus Pyrus. It is native to Europe and southern Asia. A destructive disease called fire blight can damage pear trees. Preventative measures can reduce the risk of infection.
Cause
Fire blight is a bacterial infection caused by the bacterium Erwinia amylovora.
Symptoms
A light brown ooze protruding from branches is the first sign that fire blight is present. The branch will eventually wilt, turn black and die. Blossoms are diminished.
Conditions
Warm weather with occasional rainfall is ideal for fire blight. Spores live through the winter in limb cancers and spread by rain splash and insects.
Prevention
Applying copper solution or the antibiotics streptomycin and terramycin to the blossoms will reduce the risk of fire blight. Pseudomonas fluorescens is a biological agent which prevents fire blight colonization of blossoms.
Considerations
Avoid using too much nitrogen fertilizer and avoid overwatering. Excessive pruning also invites fire blight.

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