Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . son. Treatment.—Eose bushes shouldbe watched early in the season, and assoon as any lemon-yellow spots are noticedthe affected portions should be removedand burned. Raking up and burning atthe end of the season, the leaves beneathany bushes that may have been affectedduring summer, is advisable, on accountof the winter spores so destroyed. It iswell, also, to spray such bushes, and theground beneath, during winter, with asolution of copper sulphate, or with
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . son. Treatment.—Eose bushes shouldbe watched early in the season, and assoon as any lemon-yellow spots are noticedthe affected portions should be removedand burned. Raking up and burning atthe end of the season, the leaves beneathany bushes that may have been affectedduring summer, is advisable, on accountof the winter spores so destroyed. It iswell, also, to spray such bushes, and theground beneath, during winter, with asolution of copper sulphate, or with someother fungicide. Probably spraying withthe ammoniacal copper carbonate in spring, after theleaves expand, would prove helpful if needed. A good account of this fungus, illustrated with acolored plate, may be found in the United States De-partment of Agriculture, Report for 1887 (pp. 369-371). FIG. 52. WINTER SPOKE. 3IAGXIFIED. THE EOSE PHKAGMIDIUM 117 The Rose Phragmidium Phragmidiiim speciosum The peculiar appearance of this disease when attack-ing tlie stems of ro^ei is well illustrated in Fig. 52 a. bark of such Vfffi. stems is more or lesscovered with irregu-lar black patches, con-sisting of vast num-bers of the winterspores of the fungus,borne upon 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 part
Size: 902px × 2770px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
