. Diseases of economic plants. Plant diseases. DISEASES OF SPECIAL CROPS 83 Pacific coast canker, black-spot canker' {Macrophoma curvispora Veck). — The Pacific coast canker is particu- larly destructive in the northwestern states west of the Cascade Moun- tains. It was first noted about 1893 when it developed in such destruc- tive form as to cause the Wash- ington State Board of Horti- culture to call upon the Federal Government for its investiga- tion. It has since been reported in Oregon, Idaho, Nebraska, and British Columbia. The bark or sap- wood of twigs and larger branches is the seat o
. Diseases of economic plants. Plant diseases. DISEASES OF SPECIAL CROPS 83 Pacific coast canker, black-spot canker' {Macrophoma curvispora Veck). — The Pacific coast canker is particu- larly destructive in the northwestern states west of the Cascade Moun- tains. It was first noted about 1893 when it developed in such destruc- tive form as to cause the Wash- ington State Board of Horti- culture to call upon the Federal Government for its investiga- tion. It has since been reported in Oregon, Idaho, Nebraska, and British Columbia. The bark or sap- wood of twigs and larger branches is the seat of infec- tion, but the dis- ease may occur also upon the fruit when in storage. The loss of an entire orchard within a few years has resulted from the black- spot canker. Young trees, omng to their tender bark, are especially susceptible. 1 Lawrence, W. H., Wash. Agr. Exp. Sta. Bui. G6, p. .5, •Black spot canker (macrophomose). After 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 Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York, Macmillan
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