. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 170 FUNGOUS DISEASES OF PLANTS be brought in contact with tubers. They penetrate the tubers as readily as the leaves, the dry rot being produced in consequence. An affected tuber which does not show the disease in severe form may be used as seed, and thus the disease may be propa- gated from year to year through the seed tubers. It is now quite certain that the perennial appearance of the disease is due to this use of diseased tubers. It is not always possible, how- ever, to determ
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 170 FUNGOUS DISEASES OF PLANTS be brought in contact with tubers. They penetrate the tubers as readily as the leaves, the dry rot being produced in consequence. An affected tuber which does not show the disease in severe form may be used as seed, and thus the disease may be propa- gated from year to year through the seed tubers. It is now quite certain that the perennial appearance of the disease is due to this use of diseased tubers. It is not always possible, how- ever, to determine if the mycelium is present in the tubers, since, even though they may have been stored for many months, the. Fig. 63. Control of Late Blight of Potatoes by Bordeaux Mixture (Photograph by F. C. Stewart) fungus will not develop further if the conditions are unfavorable. Thus if stored at a low temperature and in a dry atmosphere the rot fungus may not become evident. No oosporic stage of the Phytophthora has been found in the host, but recently Clinton (Conn. Agl. Exp. Sta. Report, 1909-1910) has obtained mature oospores in cultures of the fungus on oat-juice agar. Control. Studies looking toward the prevention of the potato blight were begun during the middle of the past century. At first the greatest success was accomplished only in securing. 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
Size: 1888px × 1323px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorduggarbe, bookcentury1900, bookdecade1900, bookyear1909
