Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Fruits and Nuts 87 Crinkle, Dimples, White Spot.—The surface of affected peaches when nearly full-grown is rough and marked with slight, roundish elevations and depressions, the latter being of a lighter color (fig. 38). In cross section the depressions are seen to be due to a narrow strip of dry tissue just beneath the surface. This trouble has appeared during certain sea- sons in the Tuscan variety, and is apparently due to some climatic or soil effect. Crown Gall.—Badly affected trees ar
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 Diseases of Fruits and Nuts 87 Crinkle, Dimples, White Spot.—The surface of affected peaches when nearly full-grown is rough and marked with slight, roundish elevations and depressions, the latter being of a lighter color (fig. 38). In cross section the depressions are seen to be due to a narrow strip of dry tissue just beneath the surface. This trouble has appeared during certain sea- sons in the Tuscan variety, and is apparently due to some climatic or soil effect. Crown Gall.—Badly affected trees are stunted and of a pale color. Rough, woody, roundish enlargements or galls of various sizes are found Fig. 38.—Peaches showing 'crinkle.' on the roots, crowns, and often on trunks and limbs. The trouble is due to Phytomo7ias tumefaciens. See page 7 under 'Almond,' for full discussion of crown gall. The peach root is very susceptible to this bacterial disease. In new plantings much care should be taken to avoid infected nursery stock. Delayed Foliation, Dormosis.—In certain seasons, growth fails to start at the proper time in spring and the trees remain bare and appar- ently dormant until well into the summer. The leaves and new shoots may eventually develop in a weak, straggling manner, or the top may die back. Walnuts, apples, and other fruit trees are similarly affected. This condition occurs in the warmer sections of the state, in seasons following warm, frostless winters when there has not been enough cold weather to break the rest period of trees and stimulate new growth.
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