Pest identification and confirmation—Crown gall
The crown gall bacteria stimulate the plant to produce actively growing, disorganized tissue, which originates
in the cambium and appears on bark. The surface of a crown gall is the same color as healthy bark and
gall wood has the same color as normal wood. However, when cut with a knife, crown galls are softer than
normal wood and lack the typical pattern of annual growth rings. Galls can be tiny and smooth on young
plants, but are commonly rough and sometimes massive on mature trees. |  Warty
tumor of crown gall
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