Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 20 California Agricultural Extension Service [Cik. 120 some sides almost no growth takes place, although the tissue is alive and sound, while at other places the wood develops vigorously and bulges out in ridges. This is seldom seen except on orchard trees top-grafted with Gravenstein scions above the crotches. The cause is unknown. The flat-limb condition persists in scions taken from affected trees and may be a virus disease. Hairy Root.—See 'Crown Gall' (p. 16). Fig. 6.—Little-leaf of apple. Norm
Diseases of fruits and nuts Diseases of fruits and nuts diseasesoffruits120smit Year: 1941 20 California Agricultural Extension Service [Cik. 120 some sides almost no growth takes place, although the tissue is alive and sound, while at other places the wood develops vigorously and bulges out in ridges. This is seldom seen except on orchard trees top-grafted with Gravenstein scions above the crotches. The cause is unknown. The flat-limb condition persists in scions taken from affected trees and may be a virus disease. Hairy Root.—See 'Crown Gall' (p. 16). Fig. 6.—Little-leaf of apple. Normal twig on left. Internal Brovning.—In certain varieties of apples, especially the Yellow Newtown, grown in cool, moist localities, there is a tendency for the flesh to develop a soft, brown condition in storage. This is worse on fruit which is left on the trees until late in the season. In storage, more browning develops at 32° Fahrenheit than at higher temperatures. The trouble is nonparasitic. The conditions which prevent internal browning (early picking, stor- age at moderate temperatures) are exactly those which favor bitter pit, so that the methods of handling the two diseases conflict with one an- other. Fortunately, however, these diseases are not apt to be equally bad on the same variety of apple. With the Yellow Newtown, if the apples are left on the trees until they are mature and then stored at 36° to 37°
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