. Fungous diseases of plants, with chapters on physiology, culture methods and technique . - infection. Ithas been shown that ginseng is able to stand a very strong solution 3o8 FUNGOUS DISEASES OF PLANTS of Bordeaux mixture, so that the ordinary strength may be usedwithout causing any trouble. In the case of the early sprayingsin the spring when there is apt to be cold weather, it has beenfound that plants will sometimes be injured by the Bordeaux. Ifcare is taken not to apply the mixture just before a hard freeze,little trouble will result. Alternaria Violae Gall. & Dorsett ^ produces a leaf
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . - infection. Ithas been shown that ginseng is able to stand a very strong solution 3o8 FUNGOUS DISEASES OF PLANTS of Bordeaux mixture, so that the ordinary strength may be usedwithout causing any trouble. In the case of the early sprayingsin the spring when there is apt to be cold weather, it has beenfound that plants will sometimes be injured by the Bordeaux. Ifcare is taken not to apply the mixture just before a hard freeze,little trouble will result. Alternaria Violae Gall. & Dorsett ^ produces a leaf spot of violetsin the greenhouse, particularly when the houses are not well regu-lated with respect to dryness or moisture of the air, heat and cold,. Fig. 140. Leaf Spot of Beets; a Field of Sugar Beets badly Diseased or when the stock is not in condition for vigorous growth. Theold spots, as in the case of most violet leaf diseases, are white,although at the outset the spot is dark, and on the stem (which issometimes affected) the darkened areas are often persistent. Alternaria Brassicae (Berk.) Sacc. This species is not uncom-mon upon cabbage and horse radish in Europe and America. Itproduces brown spots with concentric markings. 1 Dorsett, P. H. Spot Disease of the Violet. Div. Veg. Phys. and Path., U. Agl. Built. 23 : 1-16. pis. 7-7. 1900. FUNGI IMPERFECTI 309 XVII. LEAF SPOT OF BEETSCercospora Beticola Sacc. DuGGAR, B. M. Leaf Spot of the Beet. Cornell Agl. Exp. Sta. Built. 163: 352-359- A-f-J^-^^- 1^98-Pammel, L. H. Spot Disease of Beets. Iowa Agl. Exp. Sta. Built. 16: 238- 243. 1891. Habitat relations. The beet leaf spot is widely distributed. Bothin Europe and America it is a fungus of common occurrence, andit is be
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