. Manual of fruit diseases . Fruit. GRAPE DISEASES 255 the Delaware variety. The Pockhngton, although not exten- sively grown, is apparently most susceptible. The disease appears to be of American origin, and there is little doubt but that it is still confined to this country. It was unknown until 1909, when its prevalence and cause were disco^'e^ed. Losses from dead-arm are estimated at 1 to 5 per cent annually for New York vineyards, while the total for all states concerned is unquestionably of considerable im- portance. Symptoms. The arms, trunks, green shoots, petioles, peduncles, leaf- ve
. Manual of fruit diseases . Fruit. GRAPE DISEASES 255 the Delaware variety. The Pockhngton, although not exten- sively grown, is apparently most susceptible. The disease appears to be of American origin, and there is little doubt but that it is still confined to this country. It was unknown until 1909, when its prevalence and cause were disco^'e^ed. Losses from dead-arm are estimated at 1 to 5 per cent annually for New York vineyards, while the total for all states concerned is unquestionably of considerable im- portance. Symptoms. The arms, trunks, green shoots, petioles, peduncles, leaf- veins and fruits are affected. As the name indicates, the disease exhibits itself chiefly through the death of the arms (Fig. 67). Frequently, however, the whole vine dies, in which case suckers usually grow up at the base. The affected vines may die at any. Fig. 67. — Dead-arm of the grape-vine, general 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
