. Diseases of economic plants . Plant diseases. 462 DISEASES OF ECONOMIC PLANTS in 1896 in Massachusetts. It was rapidly spread through- out this country by diseased stock, and is now known in nearly all localities where the chrysanthemum is culti- vated. The loss occasioned by the diminution in vigor of the plant and consequent imperfection of blooms is large. The sori, 2-3 mm. in di- ameter, which are diagnostic, first appear as small blisters covered by the epidermis. The rupture of this covering discloses a dark brown mass of spores. The sori are usu- ally very numerous upon the lower leaf
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. Diseases of economic plants . Plant diseases. 462 DISEASES OF ECONOMIC PLANTS in 1896 in Massachusetts. It was rapidly spread through- out this country by diseased stock, and is now known in nearly all localities where the chrysanthemum is culti- vated. The loss occasioned by the diminution in vigor of the plant and consequent imperfection of blooms is large. The sori, 2-3 mm. in di- ameter, which are diagnostic, first appear as small blisters covered by the epidermis. The rupture of this covering discloses a dark brown mass of spores. The sori are usu- ally very numerous upon the lower leaf surface, less abun- dant above, and the spores as Uberated form dusty coatings upon the leaves. Badly af- fected leaves curl, shrivel, and dia The plants are dwarfed and fail to produce flowers of value. All new stock introduced to the houses should be care- fully inspected and all diseased stock destroyed by fire. New stock should be isolated and watched for a month or more to be sure that no rust develops. If disease appears, all affected leaves should be picked and burned with pre- cautions to avoid scattering the spores. If the rust con- tinues to appear, all aboveground parts must be destroyed by fire at the end of the season, and plants for the next year raised in uncontaminated soil and house.. FlQ. 199.— Chrysanthemum leaf show ing rust sori. Original.. 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.. Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York : Macmillan