. Manual of fruit diseases . Fruit. 256 MANUAL OF FRUIT DISEASES time. However, the majority die in winter. Occasionally longitudinally ribbed excrescences develop on the trunk or arm of diseased vines. These outgrowths are not fleshy, nor are they hard, and they should not be confused with crown-gall (see page 253) and outgrowths following winter-injury. In- ternal symptoms are characterized by a dr\' heart-rot of the trunks in affected por- tions. In Jime or early July the leaves show a peculiar yellowing, dwarfing and curling. Later, the dis- coloration disappears, al- though the other abno
. Manual of fruit diseases . Fruit. 256 MANUAL OF FRUIT DISEASES time. However, the majority die in winter. Occasionally longitudinally ribbed excrescences develop on the trunk or arm of diseased vines. These outgrowths are not fleshy, nor are they hard, and they should not be confused with crown-gall (see page 253) and outgrowths following winter-injury. In- ternal symptoms are characterized by a dr\' heart-rot of the trunks in affected por- tions. In Jime or early July the leaves show a peculiar yellowing, dwarfing and curling. Later, the dis- coloration disappears, al- though the other abnor- malities persist. Such vines, while apparently on the road to recovery, are found to be dead or are considerably weakened the following year. The vines may die during the summer and as a result the leaves wilt. IMany vines freeze to death as a result of a weak growth the previous season. On the green shoots, petioles, peduncles and leaf-veins small reddish brown or black spots are produced (Fig. 6S). These may be deep, in which case V-shaped slits are noticeable; or they are more superficial, and are so numerous as to coat the affected part for some distance. \Vhen these lesions are older, they show either as reddish elevations or as a longitudinal cracking. Berries affected with the dead-arm disease exhibit a rotting. Fig. 68. — Dead-arm on grape-canes. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hesler, L. R. (Lexemuel Ray); Whetzel, Herbert Hice, 1877-1944. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
