. Diseases of forest and shade trees, ornamental and miscellaneous plants in the United States in 1921. Trees Diseases and pests United States; Plants, Ornamental Diseases and pests United States. 472 by impairing the vigor of the leaves. Colorado V.'asLington - gentral throughout state. Oregon - general throughout v/estern part of state, vvorst disease of the hollyhock. CsJ-ifornia - not as abundant as in 1920. (v;sF). Fig. 95- Geographical distribution of Pucca nia malvacearum on i^lthea rosea in the U. S,, as reported to the Plant Disease Survey . Leaf spot caused by Cerco spora althaeina S
. Diseases of forest and shade trees, ornamental and miscellaneous plants in the United States in 1921. Trees Diseases and pests United States; Plants, Ornamental Diseases and pests United States. 472 by impairing the vigor of the leaves. Colorado V.'asLington - gentral throughout state. Oregon - general throughout v/estern part of state, vvorst disease of the hollyhock. CsJ-ifornia - not as abundant as in 1920. (v;sF). Fig. 95- Geographical distribution of Pucca nia malvacearum on i^lthea rosea in the U. S,, as reported to the Plant Disease Survey . Leaf spot caused by Cerco spora althaeina Sacc. Delav/are, Minnesota. /mthracnose caused by Colletotrichum malvarum (B. & C.) South. Delav/are - stem ard leaf infection. Root rot caused by Ozonium omnivorum Shear Texas - important, reduces the crop about 10%. HYDPviWGEA (Hydrangea hortensia) Leaf spot caused by Phyllosticta hydran^eae Ell. c; Ev. New York Frost in,jury Ohio IRIS (Iris spp.) Sclerotium caused by Sclerotium rolfsii Sacc. California - to all appearances was secondary following insect injury. (WSP). 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 Martin, G. Hamilton; United States. Plant Disease Survey. [Washington, D. C. ] : Plant Disease Survey, Bureau of Plant Industry, United States Department of Agriculture
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1922
