Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . long slen-der stalks, as seen,much magnified, at spores themselvesare divided by trans-verse partitions intofrom five to sevencells. The myceliumof this fungus devel-ops in the inner barkand the cambiumlayer of the stems,but is believed not topenetrate into thewoody tissue. Ofcourse it interfereswith the flow of sap,and when, as oftena b hap])ens, it extends FIG. 52. ROSE PHKAGMiDiuM. clcar arouud the stem, a, Affected stem; 6, winter spores. it may J
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . long slen-der stalks, as seen,much magnified, at spores themselvesare divided by trans-verse partitions intofrom five to sevencells. The myceliumof this fungus devel-ops in the inner barkand the cambiumlayer of the stems,but is believed not topenetrate into thewoody tissue. Ofcourse it interfereswith the flow of sap,and when, as oftena b hap])ens, it extends FIG. 52. ROSE PHKAGMiDiuM. clcar arouud the stem, a, Affected stem; 6, winter spores. it may JOrOVO fatal to the plant. The mycelium is perennial in the stems,living from one season till the next, so that when onceinfested there is no way of ridding a plant of it. The 118 FUXGI AXD FUNGICIDES only remedial treatment suggested is to cut aad burninfested parts of bushes. Probably spraying or washingthe stems with the Bordeaux mixture will prove advan-tageous in preventing the ingress of the parasite. A short article concerning this fungus appears inthe report of the United States Department of Agricul-ture for 1887, Pacre FUNGI AFFECTING FLOWERS The Hollyhock Rust Puccinia malvacearum This fungus is a iiative of Chili, from whence,about 1869, it was introduced into Europe, where it hasdone much damage. It first appeared on hollyhocks inthis country in 1886, having been accidentally importedinto Massachusetts the previous year on another then it has gradually spread in various appears in May and June, in the shape of yellow ororange spots, on the leaves and stems of the holly-hock. These spots occur especially on the under sur-face of the leaves ; they increase rapidly in size, and theyellow color gives way to a brown. The spots, or sori,are composed of two-celled sj^orcs. When they are veryabundant they cause the plant to become sere and brown,preventing, in whole or in part, the production of flow-ers. A leaf showing the sori on the under
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
