Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 DISEASES OF SPECIAL CROPS 8B Pacific coast canker, black-spot canker1 (Macrophoma curvispora Peck). — 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
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 DISEASES OF SPECIAL CROPS 8B Pacific coast canker, black-spot canker1 (Macrophoma curvispora Peck). — 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. Tne loss of an entire orchard within a few years has resulted from the black- spot canker. Young trees, owing to their tender bark, are especially susceptible. 1 Lawrence, W. H., Wash. Agr. Exp. Sta. Bui. 66, p. 5, 1904. Fig. 30. Black spot canker (macrophomose). Cordley. After
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