Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 528 THE PATHOGENIC SLIME-FUNGI. considered quite a safe interval, but seven years is, and with good management the disease, though by no means uncommon, only then attains serious dimensions in moist seasons, Massee points out that the development of the fungus is favoured by acids and checked by alkalis; this explains the well-known beneficial effects of dressings of lime or potash in keeping the dise
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 528 THE PATHOGENIC SLIME-FUNGI. considered quite a safe interval, but seven years is, and with good management the disease, though by no means uncommon, only then attains serious dimensions in moist seasons, Massee points out that the development of the fungus is favoured by acids and checked by alkalis; this explains the well-known beneficial effects of dressings of lime or potash in keeping the disease in check. With a six or seven-year rotation, and the application of lime once in the rotation, the disease should Fig. 318.—Hypertrophied cells from a Cabbage-root attacked by Plasmodiophora brassicae. Several of the cells are filled with spores, (v. Tubenf del.) never be very injurious. The direct application of farmyard manure to the turnip crop should also be avoided, especially if the stock which made the manure was fed on diseased turnips; this is necessary because it has been found that the spores are not killed when eaten by animals.] (Edit.) Plasmodiophora vitis Yiala et Sauv. This is said to cause a Vine disease known as ' Brunissure,' which within recent years has caused considerable loss in France, North America, and Southern Paissia. The early symptoms are light- brown star-shaped spots on the upper surface of the leaves between the ribs. The spots enlarge and cause a premature fall of the leaf, whereby the grapes are prevented from maturing. ' Viala et Sauvageau, Compt. rend., cxiv., 1892. -Cooke (Gardcnpyii Cliroyncle, 1893) refers swellings found by him on roots of the vine in England to the action of this fungus. (Edit.)
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