Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 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, c
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 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 well.
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