. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 413 germ pores equatorially disposed and opposite. Upon many hosts the uredospores are produced throughout a very long season. They may appear upon grain or blue grass in the early spring before the aecidiospore may be developed in the same region. In many cases it is evident that the rust may be propagated from year to year by continuous generations of the uredospores. Again, it has been experimentally shown that uredospores may retain the power of. Fig. 203. P
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 413 germ pores equatorially disposed and opposite. Upon many hosts the uredospores are produced throughout a very long season. They may appear upon grain or blue grass in the early spring before the aecidiospore may be developed in the same region. In many cases it is evident that the rust may be propagated from year to year by continuous generations of the uredospores. Again, it has been experimentally shown that uredospores may retain the power of. Fig. 203. Puccinu gramikis: Uredospores and Teleutospores germination for weeks. It is, therefore, generally possible to ac- count for the appearance of rust, even in spring grain, at a dis- tance from the alternate barberry host. In seeking to explain the infections in spring grain as due to the uredo stage from some neighboring grass stubble, it should be remembered that artificial inoculation experiments have shown a very definite restriction of hosts in the different physiological species. Some who have fol- lowed carefully outbreaks of rust in the grain fields, year after year in the Northwest, feel that the problem is not yet completely. 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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