00000nam 2200000za 4500 9.823161 CaOODSP 20250303104652 cr ||||||||||| 160824s1931 oncaod|#o f000 0 eng d CaOODSP eng n-cnp-- A12-2/140-1931E-PDF Johnson, Thorvaldur. A study of the effect of environmental factors on the variability of physiologic forms of Puccinia Graminis Tritici. Erikss. and Henn. [electronic resource] / by Thorvaldur Johnson. At head of title: Studies in cereal diseases VI Ottawa : Division of Botany, Dominion Experimental Farms : Dominion of Canada Department of Agriculture, 1931. 76 p. : ill. Bulletin, New series ; no. 140 Title from cover. Originally presented as the author's thesis (doctoral-- University of Minnesota). Historical publication digitized from Agriculture and Agri-Food Canada collection. Includes bibliographical references. Partial contents: Part I, Studies on the effects of environmental factors on the uredinial development of certain physiologic forms of Puccinia Graminis Tritici -- Part II, Studies on the effects of environmental factors on the formation and germiniation of teliospores of certain physiologic forms of Puccinia Graminis Tritici. "This study falls naturally into two divisions. The first is concerned with the effect of environmental conditions on the development of the uredinial stage of wheat stem rust; the second deals with their effect on the formation and germination of the teliospores. In both these fields the role of environment has been made manifest, partly through observation, partly through controlled experiments"--Introd., p. [3]. gccst Cereals gccst Plant diseases Canada. Department of Agriculture. Canada. Division of Botany. Bulletin (Canada. Department of Agriculture) no. 140 (CaOODSP)9.812039 PDF 6.52 MB https://publications.gc.ca/collections/collection_2016/aac-aafc/agrhist/A12-2-140-1931-eng.pdf