. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. PLANTS AS DISEASE PRODUCERS 313 with Bacillus Iracheiphilus and young cucumbers where the organ- ism was inoculated from young cultures, and on susceptible plants by needle-pricks, showed that signs of disease rarely appeared in less than three to four days, and that signs of wilt and change of color usually were visible in five to seven days. In the case of the white pine blister rust, Cronartium ribicola, the period of incubation in the pine is from one to six years. Duration of Disea
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. PLANTS AS DISEASE PRODUCERS 313 with Bacillus Iracheiphilus and young cucumbers where the organ- ism was inoculated from young cultures, and on susceptible plants by needle-pricks, showed that signs of disease rarely appeared in less than three to four days, and that signs of wilt and change of color usually were visible in five to seven days. In the case of the white pine blister rust, Cronartium ribicola, the period of incubation in the pine is from one to six years. Duration of Disease.—The resistance of plants to disease is various even after the fungus has obtained an entrance into the tissue of the. Fig. 127.—Chestnut, Caslanea dentata, killed by blight fungus, Endothia parascaiti. Cold Spring Harbor, L. I., July, 1914. host. In the case of large trees like the white oak, a number of years may elapse before the tree finally succumbs to such fungi, as Fames {Polyporus) applanatus. A chestnut tree a few miles outside of Philadelphia resisted the chestnut-blight disease for over four years from the time of first infection before it finally succumbed. Smith {loc. cit.) describes how a good-sized potato tuber was half rotted in five days at ordinary autumn temperatures when inoculated with Bacillus phyiopUhorus by means of a few 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 Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co
Size: 1814px × 1378px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
