. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 165 nest broom of the red cedar and the great bush- like brooms of the bal- sam fir. These have al- ready been described as stimulated portions of the host plant which, with the fungus parasite, live in partnership at the expense of the neighbor- ing parts of the host. Besides this deforming power of many rusts these parasites are injuri- ous in the stealing of nourishment which they accomplish at the ex- pense of the host and in the wounding of plant parts. The host, as a re- sult, becomes impover- ished and may finally en-
. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 165 nest broom of the red cedar and the great bush- like brooms of the bal- sam fir. These have al- ready been described as stimulated portions of the host plant which, with the fungus parasite, live in partnership at the expense of the neighbor- ing parts of the host. Besides this deforming power of many rusts these parasites are injuri- ous in the stealing of nourishment which they accomplish at the ex- pense of the host and in the wounding of plant parts. The host, as a re- sult, becomes impover- ished and may finally en- tirely succumb. Thus wheat rust annually robs farmers of enormous sums of money by im- poverishing wheat plants. Practically all classes and groups of flowering plants are attacked by rusts as are also certain fern plants. The lower plants as mossworts and algae seem to be free from these parasites. The favorite hosts of the rust fungi seem to be the grasses, for on these plants are found an enor-. FlG. 77.—Spores of a grass rust fungus (Puc- cinia vexans); above, winter spores; in the middle, summer spores; below, amphispores. C Summer-spore-like in germination, but rest- ing over winter.) Highly magnified. Micro- photograph by E. W. D. 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 Freeman, Edward Monroe, 1875-. Saint Paul, Minn.
Size: 972px × 2572px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantdi, bookyear1905
