. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ^^t^^^Ba^t^^ ^jj^l^^ another, corresponding ^^^ ^K^i^WP^.. ^.jm^^^^^i more nearly to separate branches. The sporesor zoosporangia areslightly violet tinted inmass and generallyovate in outline. Thegermination of the sporehas been followed care-fully and is know^n totake place by means ofthe characteristic motilezoospores. Clintonalone has illustrated thevarious stages of germi-nation (Fig. 54,<f andrt^).F,G. 55. Teronospora on Young Leaf Occasionally the normal sporophores are accompanied
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ^^t^^^Ba^t^^ ^jj^l^^ another, corresponding ^^^ ^K^i^WP^.. ^.jm^^^^^i more nearly to separate branches. The sporesor zoosporangia areslightly violet tinted inmass and generallyovate in outline. Thegermination of the sporehas been followed care-fully and is know^n totake place by means ofthe characteristic motilezoospores. Clintonalone has illustrated thevarious stages of germi-nation (Fig. 54,<f andrt^).F,G. 55. Teronospora on Young Leaf Occasionally the normal sporophores are accompanied by short, swollen hyphae (Fig. 54, b),which may also bear spores. It is believed that the latter are pro-duced under unfavorable conditions, and similar modifications havebeen noted in other species. The oosporic form of this species hasnot yet been found, and it is doubtful if it occurs in this countiy. Control. Very careful experiments have been made with a viewto holding in check the ravages of this fungus, and it has beenfound that the greater part of the damage can be prevented by. PHYCOMYCETES l6l properly spraying with Bordeaux mixture. Seven sprayings inNew York have almost invariably enabled growers to control thisdisease. The 5-5-50 formula may be recommended. Plasmopara Halstedii Farl. is widely distributed in the UnitedStates, where it is found on various members of the Compositae,especially sunflower and Jerusalem artichoke, Heliarithtis afiminsand Heliaiithics. ttiberosiis, species of Bidens, etc. XIV. SCLEROSPORA CuGiNi, G., and Traverso, G. B. La Sclerospora macrospora Sacc. parasitadella Zea Mays. Le Stazioni speriment. agrar. italiane. 35 : 46-49. Traverso, G. B. Note critiche sopra la Sclerospora parassite di 16: 280-290. 1902. There are perhaps three species of this genus. The specieswhich has been apparently most widely distributed and bestknown is Sclerospora gramiJiicola (Sacc.) Schroet. This speciesoccurs upon several grasses, espec
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