. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. UROCYSTIS 349 is recommended that onions should be transplanted, because at a certain age the plants cannot be infected, even if spores are in the ground. Diseased plants should be collected when thinning is in operation. Thaxter, A?in. Rep. Conti. Expt. Stat., p. 129 (1890). •51 j. Fig. 105.—Urocystis colchici. i, portion of infected leaf ; 2, a single sorus, slightly mag. ; 3, spores, highly mag. ColcMcium smut {Urocysiis cokhici, Rab.) forms long rows
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. UROCYSTIS 349 is recommended that onions should be transplanted, because at a certain age the plants cannot be infected, even if spores are in the ground. Diseased plants should be collected when thinning is in operation. Thaxter, A?in. Rep. Conti. Expt. Stat., p. 129 (1890). •51 j. Fig. 105.—Urocystis colchici. i, portion of infected leaf ; 2, a single sorus, slightly mag. ; 3, spores, highly mag. ColcMcium smut {Urocysiis cokhici, Rab.) forms long rows of black, powdery streaks on the leaves of colchicum— Colchiaun autum/ta/e, Muscari racemosu/n, M. comosum, Scilla Infolia, Allium rotundi/m, A. cepa, A. tnagiatm, and Paris quadrifolia. Spore-clusters globose or oblong, 20-33 X 16-20/x; central fertile spores chestnut-brown, sterile peripheral cells pale yellowish-brown, small. Gladiolus smut {Urocystis gladioli, Smith) sometimes attacks the corms of cultivated kinds of Gladiolus in this country. The spore-balls average 40-50 /x diam. The central fertile spores are dark brown, angularly globose, smooth, 4-6 /x diam., sterile peripheral cells numerous, pale. Destroy infected corms, as cure is out of 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 Massee, George, 1850-1917. New York : Macmillan
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
