Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 400 Diseases of Economic Plants Rust (Cronartium cerebrum (Pk.) H. & L., Peridermium). — Swollen areas occur upon the branches and young stems which are gradually killed. The gall-like growth sheds a Fig. 212. Gall produced by Cronartium (Perider- mium) cerebrum on pine. After Hedgcock. profusion of orange-colored spores each spring. Chiefly by its interference with the sap current the swellings bring about the death of many trees. The galls are perennial and may

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