. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 409 Probably the most important species of the rust family, both from an economic point of view and also from the point of view of the development of mycological research, is the common species, Puccinia graminis, upon cereals. It was upon this species that the classical researches of De Bary (1865 et seq.) were based, throwing light upon many phenomena of parasitism. In more recent times this species has served further as a means of developing a knowledge of bi
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 409 Probably the most important species of the rust family, both from an economic point of view and also from the point of view of the development of mycological research, is the common species, Puccinia graminis, upon cereals. It was upon this species that the classical researches of De Bary (1865 et seq.) were based, throwing light upon many phenomena of parasitism. In more recent times this species has served further as a means of developing a knowledge of biological and physiological forms, or specialized races. It has been the means, also, of showing the relation of the summer spore, or uredo stages, to the continual propagation of certain rust forms, and Eriks- son's mycoplasm theory sought evidence in phenomena ob- served in this species. Distribution and occurrence. It would appear that this fungus is distributed, in one or more of its numerous forms or races, throughout the world wherever certain grasses may be found. It is not in all regions the most common cereal rust, but in general it is so considered. The economic work upon rust fungi in such widely separated and important cereal-growing countries of the world as Australia, Russia, Western Europe, and the United States has been largely concerned with this species. It is therefore the fungus which is commonly known as rust of wheat, oats, barley, and other cereals and many grasses. It is not at all restricted by minor climatic conditions, and in the United States it is found in its various forms upon certain grasses from the moist Atlantic seaboard to the most arid portions of the Great Plains, and from the Gulf Coast to the Great Lakes. The annual losses throughout the world amount to a stupendous figure, often estimated to reach one hundred million Fig. 201. Rust ok Oats. Please note that these images are extracted from scanned page images that may have been d
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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
