. Fungous malattie delle piante : con i capitoli sulla fisiologia, metodi di coltura e la tecnica . Funghi in agricoltura. 446 FUNGOUS malattie delle piante ed è molto probabile che alcuni lo smorzamento-off che è stata attribuita a Pythium potrebbe essere correttamente di cui al danno da questo fungo. Non è possibile al momento attuale per dire senz'altro che tale smorzamento off-malattie come quelle del cotone, lattuga, ecc., sono prodotti dalla stessa specie o razza di Rhizoctonia come quella che si trova sulla patata, ma non vi è motivo di ritenere che le differenze che si verificano tra le varie forme di th

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. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 446 FUNGOUS DISEASES OF PLANTS and it is very probable that some of the damping-off which has been ascribed to Pythium could be properly referred to damage by this fungus. It is not possible at the present time to say definitely that such damping-off diseases as those of cotton, lettuce, etc., are produced by the same species or race of Rhizoctonia as that which is found upon the potato, but there is reason to believe that the differences which occur between the various forms of the parasite upon a large num- ber of hosts are only such as might be considered varietal or racial, and in some instances we have unquestionably to do with physiological forms. It is certain, however, that Rhizoc- tonia Medicaginis De C. of Europe is a fungus very differ- ent from the common potato fungus of Europe and America and also from the common species producing damping-off of seedlings, rot of beets, etc., in this country. Moreover, a form which has been described (Duggar and Stewart) on rhu- barb is likewise a very different organism. It would not, how- ever, be surprising to find that a very large number of the other forms which have been discussed by various authors may be ascribed to one and the same species, the perfect stage of which would now appear to be Corti- cium vagunt B. & C. var. Solani Burt. Effects upon the hosts. The fungus is perhaps most disastrous as a damping-off disease. The progress of the disease upon seed- lings resembles very closely that of Pythium, and it is affected by similar conditions. The plants that have thus far seemed to be. Fig. 218. Rhizoctonia on Radish (Photograph by H. H. Whetzel). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Duggar, Benjamin M. (Benjami

Parole chiave associate all'immagine

• bookauthorduggarbe
• bookcentury1900
• bookdecade1900
• bookyear1909