. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 498 DISEASES OF CULTIVATED PLANTS Auricula leaf blotch, caused by Heterosporiu??i auriculi (Mass.), a species remarkable for its very long, slender, often branched sporophores. The spores are not much wider than the sporophores, variable in length, 14-20 X 5-6/x, often one- septate, steel-grey with an olive tinge. Three or four large olive-green patches are present on a leaf, and as a rule all the. Fig. \^o.—IIi-tcrosporium cchinulatum. i, portion of a d
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 498 DISEASES OF CULTIVATED PLANTS Auricula leaf blotch, caused by Heterosporiu??i auriculi (Mass.), a species remarkable for its very long, slender, often branched sporophores. The spores are not much wider than the sporophores, variable in length, 14-20 X 5-6/x, often one- septate, steel-grey with an olive tinge. Three or four large olive-green patches are present on a leaf, and as a rule all the. Fig. \^o.—IIi-tcrosporium cchinulatum. i, portion of a diseased carnation ; 2, cluster of conidiophores bearing coniiiia; 3, conidium germinating, and producing secondary spores. Figs. 2 and 3 highly mag. leaves of a plant are attacked, owing to the spores being washed from one leaf to another. When the fungus is mature the tissue of tlie injured spots becomes brown, and often crumbles away leaving a hole. On cultivated species of Auricula. Excess of moisture favours the parasite. Spray with potassium sulphide and ventilate 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
