Galls in the form of small swellings occur on various portions of the limbs and twigs of quince trees. Often an entire limb is covered by the irregular, warty outgrowths. Crown Gall is the name applied to the disease irrespective of the location of the galls on the tree. The same disease affects the apple, peach and other plants. Pacific Coast growers meet with this trouble more than others in the United States. The disease also occurs in Africa. (See Apple, page 108.)


Hedgcock, G. G. Some stem tumors or knots on apple and quince trees. U. S. Agr. Dept. Plant Indus. Bur. Circ. 3: 5 - 16. 1908. (Other references, page 112.)