Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Trees and Timber 385 phore, formed in the cavities under dead branches, is from cm. in length by 1 cm. wide. The pore-bearing layer is flesh-colored. This and the preceding disease of the cedar taken together have been estimated to cause 60 per cent loss in some local- FiG. 202. — Longitudinal section of cedar showing effect of Fomea juniperinus. After von Schrenk. ities. Since they are caused by wound parasites, the removal of diseased trees and the destruction of sporophores is recomm
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 Trees and Timber 385 phore, formed in the cavities under dead branches, is from cm. in length by 1 cm. wide. The pore-bearing layer is flesh-colored. This and the preceding disease of the cedar taken together have been estimated to cause 60 per cent loss in some local- FiG. 202. — Longitudinal section of cedar showing effect of Fomea juniperinus. After von Schrenk. ities. Since they are caused by wound parasites, the removal of diseased trees and the destruction of sporophores is recommended. Cedar canker (Phoma sp.). — This canker is found on juniper and arbor-vitae. Injury apparently occurs only on trees under four years old. Prior to that age entire seed beds may be destroyed.
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