. Diseases of cereal and forage crops in the United States in 1920. Grain Diseases and pests United States; Forage plants Diseases and pests United States. 131 rence of Piaccinia graminis^ on barberry. Paytopath. 11: 39--4^» 1921.) have de- termined that teliospores in the south lose their viability during tii© winter and are hence incapable of germination in the sprin^j. This offers an explana- tion for their observations that aecia on barberry are not commonly found south of 40° latitude, ex-jept' at higher islevations where heavy infection was found as far south as 37°» '^"^ ^-^ s
. Diseases of cereal and forage crops in the United States in 1920. Grain Diseases and pests United States; Forage plants Diseases and pests United States. 131 rence of Piaccinia graminis^ on barberry. Paytopath. 11: 39--4^» 1921.) have de- termined that teliospores in the south lose their viability during tii© winter and are hence incapable of germination in the sprin^j. This offers an explana- tion for their observations that aecia on barberry are not commonly found south of 40° latitude, ex-jept' at higher islevations where heavy infection was found as far south as 37°» '^"^ ^-^ substantial agreement with the occur- rence as sao"m on the I m= Mahonia-. diversif olia Sweet (E. a qui folium Lindl. ) ! x= B. vulgaris L-' â Pig. 25- Occurrence on various hosts of aecia of stem rust (Puccinia t^raminis) as recorded, in the North American Flora. The different hosts are designated by symbols. Stakman comments in part on the question of overwintering as follows (Cereal nourior 12: 24I. July31, 1520): "Stem rust did not over'vinter in the uredinial stage on winter wheat at St- Paul, Minnesota. There is some evidence that it may have overwintered on a plot of v^inter wheat at Kladison, ^Visconsin. The pre- sumptive evidence is strong that rust may have developed from barberry in eastern Nebraska, lovva, southern Minnesota, and eastern South Dakota. On the other hand, it is quite possible that it may have spread gradu- ally nortaward from farther iouth The only rust foand on A;-:rostis alba so far has been traced to rusted barberry. Barberries began to rust early in May and rust began to develop in vheat fields about June 20. So far the circimstantial evidenr-e is strong that much rust undoubtedly came from barberry. On the other hand there also is. 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
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1921
