. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 2691. Swanley ( â 'â mimber of diseases, each of whi-di is characterized by one or more distinct symptoms. The principal diseases are as follows, their destrnctiveness being in the order in which thev are discussed: Spot disease (AUervaria vlohr] .-T\)\^ disease, also called the disease, leaf-spot, leaf-rust an
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 2691. Swanley ( â 'â mimber of diseases, each of whi-di is characterized by one or more distinct symptoms. The principal diseases are as follows, their destrnctiveness being in the order in which thev are discussed: Spot disease (AUervaria vlohr] .-T\)\^ disease, also called the disease, leaf-spot, leaf-rust and small- House of Violets. etc., prodtice spots very similar in outline and apf)oar- ance to those caused l)y A Itvrnarid viohi , iiut only tinder conditions peculiarly favorafile to these fungi do they cause au}^ serious loss. For recent information on tliis disease, see"S]Mit l>isease of the Violet," Bull. 23, Div. Veg. Physiolotry und Pathology, F. S. Dept. Agric. Koot rot [Thieh/ ria hii.'<iro!a.) . â Thif^ disease is very troublesome and destructive in some localities espe- cially to young plants that are transplanted during hot, dry weather. It causes the browning or blackening of the parts attacked and the final death of the plant. Wet rot (Bolryfis sp.). â ThiH fungus attacks leaves, detioles, flower-stalks and tlow^ers, causing a wet or soft rot. It is sometimes very destructive, especially with large plants growing in a damp, stagnant atmosphere, where there is insuthcient ventilation and light. Leaf-fading or yellowing. âThis is induced liy a va- riety of conditions, but as yet little that is definite has been ascertained regarding its cause. Remedies. âIt is difficult to exterminate any of the diseases named after they once gain a foothold. How- ever, they can be held in check and often entirely pre- vented by selecting and propagating exclusively from strong, vigorous, disease-resistant plants, and by keep- ing them in the best possible growin
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