. Manual of fruit diseases . Fruit. 412 MANUAL OF FRUIT DISEASES lesions are found most commonh' on the canes (Fig. 120), although the berries may be directly affected. All or only a portion of a cane is involved, in which case the foliage suddenly wilts and becomes dry. Often only a single branch wilts; the remainder of the plant then continues normal activities and appearances (Fig. 120). Frequently only a portion of a cane is blighted, such symptoms becoming evident as soon as the leaves unfold in the spring. Lesions commonly center about a wound left in prun- ing, from which point they ext
. Manual of fruit diseases . Fruit. 412 MANUAL OF FRUIT DISEASES lesions are found most commonh' on the canes (Fig. 120), although the berries may be directly affected. All or only a portion of a cane is involved, in which case the foliage suddenly wilts and becomes dry. Often only a single branch wilts; the remainder of the plant then continues normal activities and appearances (Fig. 120). Frequently only a portion of a cane is blighted, such symptoms becoming evident as soon as the leaves unfold in the spring. Lesions commonly center about a wound left in prun- ing, from which point they extend downward. There is B, tendency on black varieties for the disease to affect only one side of a cane. The dis- eased area is brown and the cane be- comes very brittle at such points. Very early in the blighting of a cane, black fruit-pustules of the pathogene appear on the lesions (Fig. 121); from these pustules masses of reproductive bodies ooze out on the bark, giving the affected portion a brownish smoke-colored appearance. The spots are not always limited in extent; in some cases they are generalized, the wood cracks, and the bark peels off at the lower portion of the affected cane. The cane-blight disease may be confused with the work of the raspberry-cane borer {Oberea bimaculata). But in cane-. FiG. 120. — Raspberry eane-blight; healthy plants on right, blighted canes on 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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