. Diseases of fruits and nuts. Fruit; Nuts. 110 California Agricultural Extension Service [Cir. 120 Black Knot.—The characteristic symptom of this disease is the large, elongated, rough, black knots or swellings all over the smaller branches, which greatly injure and disfigure the tree. This is a common disease of plum and cherry in eastern states but in California has only been seen in wild species in the mountains and foothills, where it is very common in certain localities, as in Yosemite Valley. It is caused by a fungus, Diho- tryon Fig. 58.—Bacterial canker of plum. Where wild
. Diseases of fruits and nuts. Fruit; Nuts. 110 California Agricultural Extension Service [Cir. 120 Black Knot.—The characteristic symptom of this disease is the large, elongated, rough, black knots or swellings all over the smaller branches, which greatly injure and disfigure the tree. This is a common disease of plum and cherry in eastern states but in California has only been seen in wild species in the mountains and foothills, where it is very common in certain localities, as in Yosemite Valley. It is caused by a fungus, Diho- tryon Fig. 58.—Bacterial canker of plum. Where wild plums or cherries are of any value, the knots should be very thoroughly cut out as soon as they appear. If this is not sufficient to keep the disease in check, the trees may be sprayed with lime-sulfur 8-100 (p. 160) just as the buds are swelling. Brown Rot.—This is the same fungus disease as in the apricot, peach, and cherry, caused by Sclerotinia fructicola or S. laxa. Symptoms in the prune and plum are similar to those in other hosts. In the blossom-blight phase of the disease (fig. 15, p. 31), the blossoms are blasted and with- ered just as they are opening, and a grayish mold can be seen on the dead. 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 Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : The College of Agriculture, University of California
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