. 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. 452 stren;:,th) , after the leaves have unfolded and again if tlie spots appear. It may be necessary to repeat the application tvro or three weeks ; Plant Diseases in Ohio for I92I. Ohio ..gr. Exp. otate Universit;;', pa-^e 45- "ov/dery rnildev/ cauied b^. .crosphaera alni vaccinii. (Schw.) Sal:;:. Ohio - local Heartv/Qod rot caused by Poly s tictus versicolor^ (L.) Tr. Ohio
. 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. 452 stren;:,th) , after the leaves have unfolded and again if tlie spots appear. It may be necessary to repeat the application tvro or three weeks ; Plant Diseases in Ohio for I92I. Ohio ..gr. Exp. otate Universit;;', pa-^e 45- "ov/dery rnildev/ cauied b^. .crosphaera alni vaccinii. (Schw.) Sal:;:. Ohio - local Heartv/Qod rot caused by Poly s tictus versicolor^ (L.) Tr. Ohio - undoubtedly very more conuon than reported and causes serious damage to the tree by rotting cut the heart'.;ood. CATCLAVr f^gon-iar unguis - cati) Rust by Ravenelia versatilis (Pk.) Diet. Arizona. 3!lPuRY, "LSTERN GfDXE (^runus deirdssa) Leaf blister caused by Taphrina cerasi (Pckl.) Sade. V.'ashingtcn - rare. (JSE) Fig. 89. Distribution of tiae Ilacrospori'am leaf spot of the JKLSTUUT (Castanea dentata) Oatalpa in the U. S. as repor- Elight caused by Endothia parasitica (Murr.) And. ted to Plant Disease Sui'vey. (Prepared by G-. P. C-ravatt^ Office of Forest Patholo^O ''During I92I the chestnut blight continued its steady spread. In North Carolina the disease v/as found in five new counties - Rockingham, Porsj^th, Iredell, Burke, and I/icDov/fcll, making a total of thirteen infested counties in that state. In Virginia it was reported from one nevi county - Craig - and in '.'est Virginia from one new countj^ - Upshur. In all infested areas examined the percent of infected and dead trees increased during I92I. Pewspaper reports of the chestnut blight becoming less virulent and of the chestnut stand coming back have so far as investigated "oroved to be without foundation. "Two reports of chestnut blight in Indiana sent in by the Department of Conservation, Indianapolis, to the Plant Disease Survey are interesting as a warning to uninfested states
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1922
