. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. l62 FUNGOUS DISEASES OF PLANTS as well as many wild species. It frequently causes stem deformi- ties, and in England it is often associated with Cystopus candidus on Capsella, while in this country it is perhaps best known as a pest in cauli- flower culture under glass, yet occasionally destructive in cabbage cultures in the open, and less frequently occurring on radish, turnip, etc. The conidiophores, shown in Fig. 56, a, are character- istic of the genus. The co- nidia germinate
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. l62 FUNGOUS DISEASES OF PLANTS as well as many wild species. It frequently causes stem deformi- ties, and in England it is often associated with Cystopus candidus on Capsella, while in this country it is perhaps best known as a pest in cauli- flower culture under glass, yet occasionally destructive in cabbage cultures in the open, and less frequently occurring on radish, turnip, etc. The conidiophores, shown in Fig. 56, a, are character- istic of the genus. The co- nidia germinate (Fig. 56, b) from one side by means of a germ tube. The development of the oospores of this species has been carefully studied and would correspond closely to that described for Cystopus candidus except that in this Peronospora there is no true Fig. 56. Peronospora on Cabbage: Conidial Stage XVI. ONION MILDEW Peronospora Schleideniana De Bary Thaxter, R. The Onion Mildew. Conn. Agl. Exp. Sta. Rept. (1889): 155-158. Trelease, Wm. The Onion Mold. Wis. Agl. Exp. Sta. Rept. (1884): 38-44. Whetzel, H. H. Onion Blight. Cornell Agl. Exp. Sta. Built. 218 : 138-161. figs. 1-17. 1904. The onion mildew, blight, or mold is a disease which has been recognized for more than half a century. At various times since 1884 it has been reported as of consequence in parts of the United States from New England to Wisconsin. It is proba- bly far more common and destructive than has been supposed, as shown by the observations of Whetzel in 1903. The disease, in the regions referred to, appears in late June or July, and in the early morning while covered with dew it is in young stages conspicuous by a "furry violet appearance" of the affected leaves. Later the leaves become moldy in character, pale, collapsed, and often broken. Fig. 57 shows a diseased plant in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabi
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