. Manual of fruit diseases . Fruit. 368 MANUAL OF FRUIT DISEASES forming perennial cankers. Thus old neglected trees are par- ticularly a constant source of trouble and danger to other trees. These cankers are relatively large and deep on the Abundance and Burbank varieties. Cankers on the plum are somewhat ^ different in appear- â . ance from those on the apricot, necta- rine and peach. Open cankers are the more common tj'pe observed on the last ^^ tVifHh .J^^ three fruits, whereas ^Hv i "^j^HBi 1^9L ^^ ^^^ plum the af- fected bark clings to the twig for some time. Watersprouts developme
. Manual of fruit diseases . Fruit. 368 MANUAL OF FRUIT DISEASES forming perennial cankers. Thus old neglected trees are par- ticularly a constant source of trouble and danger to other trees. These cankers are relatively large and deep on the Abundance and Burbank varieties. Cankers on the plum are somewhat ^ different in appear- â . ance from those on the apricot, necta- rine and peach. Open cankers are the more common tj'pe observed on the last ^^ tVifHh .J^^ three fruits, whereas ^Hv i "^j^HBi 1^9L ^^ ^^^ plum the af- fected bark clings to the twig for some time. Watersprouts developmental of plums may at times show twenty or more cankers in various stages of development. See more complete account of Black-Spot under Peach, page 306. References Jackson, H. S. Bacteriosis of plums. Delaware Agr. Exp. Sta. Ann. rept. 16-18 : 75-76. 1907. Lewis, I. M. A bacterial canker of plum twigs. American Micros. Soc. Trans. 31: 145-149. 1912. (Additional references to literature under Peach, page 311.). Fic. 107. â Black-spot on plums ; stages. Silver-Leaf Caused by Stereum purpureum Fries "WTiile this disease has not been observed with certainty on plums in the United States, it is known on apple, and its preva- lence and destructive nature in Canada and elsewhere would. 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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