. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 331 such cross-inoculation experiments as have been made indicate that many species, at least, are not closely restricted as to hosts, and one form might be the cause of disease in a variety of plants. It has seemed to be a group which would well reward comparative study in artificial culture, and advantage has been taken of this by Stoneman,1 Edgerton,1 and others. With particular reference to species of one type, those which may represent stages of the pyrenomyce
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 331 such cross-inoculation experiments as have been made indicate that many species, at least, are not closely restricted as to hosts, and one form might be the cause of disease in a variety of plants. It has seemed to be a group which would well reward comparative study in artificial culture, and advantage has been taken of this by Stoneman,1 Edgerton,1 and others. With particular reference to species of one type, those which may represent stages of the pyrenomycetous genus Glomerella, Edgerton says in part: There are many closely related forms and species and all are variable. They vary under artificial cultivation and probably under natural conditions. Many are similar enqugh to be considered the same species, but evidence suffi- cient to warrant bringing together the related forms as one species is generally lacking. In the determination of a species too much dependence cannot be placed upon cultural characters alone. These characters are useful, but are not suffi- ciently constant to justify exclusive use. Thus far species of Glceosporium seem to have been definitely connected with three genera of Ascomycetes, as follows : Pseudope- ziza, Glomerella, and Gno- monia, the imperfect stages of which were respectively known as Glceosporium Ribis (Lib.) Mont. & Desm., Glceosporium fruc- tigenum Berk., and Glceo- sporium nervisequum Sacc. The imperfect form is in- variably the important stage from the phytopatho- logical point of view. The effects upon the hosts are in every way comparable to those resulting from the attacks of various species placed in the closely related genus Colletotrichum previously de- scribed. In fact, some species of Glceosporium occasionally pro- duce a small number of setas under special conditions. Upon the. Fig. 158. Glceosporium on Leaves of Norway Maple 1 See Bitter Rot of the Apple, p. Please note
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Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
