Gall also known as crown gall plant crown gall disease, the widespread occurrence in the world. With host pathogen widely.
Symptoms of early onset disease at the roots of plants, or root, lateral roots and aerial parts of the trunk lateral branches, appear swollen spherical or flat circular nodules. Young early tumor is white, soft, smooth surface. With the growth of the tumor increases, hard texture, the color changes to brown or dark brown, surface roughness, cracking, and even ulcers. Incidence of light can cause plant leaves is not correct, weak grower, growth retardation, the incidence of weight, can lead to death of the whole plant.