. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 400 FUNGOUS DISEASES OF PLANTS Caryophyllus), and it occurs also upon other species of this genus, and upon some other related genera. Prior to 1890 it had not been noted in the United States, and it is doubtful if it was previously common. Since that time, however, it has rapidly spread through- out the regions where carnations are grown either under glass or in the open. For a few years after its abundant appearance in this country it threatened to cause a panic in carnation grow
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 400 FUNGOUS DISEASES OF PLANTS Caryophyllus), and it occurs also upon other species of this genus, and upon some other related genera. Prior to 1890 it had not been noted in the United States, and it is doubtful if it was previously common. Since that time, however, it has rapidly spread through- out the regions where carnations are grown either under glass or in the open. For a few years after its abundant appearance in this country it threatened to cause a panic in carnation growing, and florists' magazines and papers devoted much space to a discussion of the disease, methods of control, susceptibility of varieties, Fig. 197. Carnation Rust It is now permanently established as one of the regularly antici- pated diseases of the carnation, but there is no fear that its pres- ence in any way jeopardizes carnation growing as an industry, at least so far as the best growers are concerned. Host resistance. Since the appearance of this pest there has been opportunity for selection, so that resistant varieties might be secured, or at least so that the more susceptible sorts might be discarded, particularly when more or less similar varieties may be grown which are less sensitive. Perhaps no commercial variety of this plant has proved more susceptible to the rust than the Scott. The susceptibility of this variety seemed to be intensi- fied the longer it was in the trade. The Jubilee (scarlet) and Flora Hill (white) have also proved susceptible, and these have. 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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