Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 53. CARJsATIOX INJURED BY LEAF-SPOT. and distributed bv means of wind and water. Care inwatering, and the use of fungicides, are the best reme-dial measures. There are certain other carnation diseases, such asthe anthracnose, the leaf-mold, and the rosette, whichneed hardly be discussed in this connection. Partialaccounts of them may be found in American Gardeningfor April, 1893, where also the diseases treated of above THE MIGNOXETTE DISEASE 123 are d
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 53. CARJsATIOX INJURED BY LEAF-SPOT. and distributed bv means of wind and water. Care inwatering, and the use of fungicides, are the best reme-dial measures. There are certain other carnation diseases, such asthe anthracnose, the leaf-mold, and the rosette, whichneed hardly be discussed in this connection. Partialaccounts of them may be found in American Gardeningfor April, 1893, where also the diseases treated of above THE MIGNOXETTE DISEASE 123 are described. One of the fullest accounts of the carna-tion rust, by Professor Arthur, occurs in The AmericanFlorist, Feb. 18, 1892. The Mignonette Disease Cercospora resedce Mignonettes frequently suffer from a disease whichmay first be noticed, ^^either as minute pale spots withbrownish or yellowisli boiders—little sunken areas in. %^ FIG. 54. MIGNONETTE DISEASE,a, Spore; 6, spore stalks; e, germinating spore. Magnified. the succulent tissues of the leaf—or as reddish discolora-tions which spread over the leaf, and finally developinto these pale spots or patches. These spotted areasare portions of the leaf which the fungus has invadedand destroyed. As the mycelium develops within theleaf they increase in size, and finally involve so much ofthe surface that the leaf wilts and withers; the wholeplant sometimes looks as if it had suffered severely from 124 FUXGI AXD FUNGICIDES drouth. Black specks develo23 on the surface of theinjured areas, giving it a granular appearance. Thesespecks consist of the fruiting spores of the fungus. Theyoung seed-pods are sometimes affected. If one of the little black specks be looked at fromthe side under a high power of the microscope it will beseen to resemble Fig. 54, which represents a tuft offruiting threads after they have burst through the skinof the leaf. At a is seen a sp
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
