Crown gall - a root swelling that enfeebles plants.

From: Sunset | Date: April 1, 1986 | Copyright information

Crown gall--a root swelling that enfeebles plants

Often lethal, always enfeebling, crown gall can occur wherever plants are grown. The disease is caused by a soil-dwelling microbe called Agrobacterium tumefaciens; it enters plant tissue through any sort of wound. Infection results in swellings (galls) on roots, or on the crown where trunk and roots join.

While galls on plant crowns are visible (as shown above right), you can't be certain whether galls are grow...

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