Notes on Raspberry Diseases
Crown gall and cane gall
Identification
Soil-borne bacteria that infect raspberry roots, crowns and lower stems
through wounds, cause crown gall. The bacteria induce the plant tissue
to grow abnormally, which results in the production of spongy wart-like
galls on infected crowns and roots. The galls eventually become hard and
woody as they age. Raspberry plants with numerous galls become stunted
and weak. The leaves turn yellow and dry up at the edges. The galls disintegrate
over the winter and release the disease-causing bacteria into the soil.
New galls often form in the area of the old galls the next spring.
Early symptoms of crown gall on
raspberry canes
Crown gall on roots of raspberry
Period of Activity
The bacteria that cause crown gall are present in some fields, especially
ones where tree fruit or raspberries have grown. Crown gall can also be
introduced to new fields on planting stock. Once present, the bacteria
survive for many years in decaying root galls or alternate hosts. Wounds
that result from winter injury, insect damage or cultivation encourage
new crown gall infections.
Management notes
- Do not plant canes infected with crown gall. Purchase disease-free
plants from an accredited nursery.
- Do not plant new canes in infested soil.
- Maintain good soil fertility.
- Avoid injury to crown and roots.
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