Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . r as advised for thesecond and third sprayings. Raspberry leaves are verytender and the mixture injures them slightly, but notenough to preclude its use, especially if some care istaken to keep it off the leaves of the bearing canes. Theleaves on the young shoots of the current seasons growthare not so easily harmed, hence no pains need be takento keep it off them. Mr. Green also reports good results from the ammo-niacal cojoper carbonate solution, ^^with e
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . r as advised for thesecond and third sprayings. Raspberry leaves are verytender and the mixture injures them slightly, but notenough to preclude its use, especially if some care istaken to keep it off the leaves of the bearing canes. Theleaves on the young shoots of the current seasons growthare not so easily harmed, hence no pains need be takento keep it off them. Mr. Green also reports good results from the ammo-niacal cojoper carbonate solution, ^^with even less harmto the foliage, but, all things considered, the diluteBordeaux mixture is preferred. It is advisable to cutout and burn all fruiting canes each summer as soon asthe crop is gathered. ORAKGE RUST OF BLACKBERRIES 101 The most extended account of this disease is pub-lished in the 1887 Report of the Department of Agri-culture (pp. 357-3G1). The Orange Rust Cceoma nitens The orange rust, or red rust, of blackberries, is fa-miliar to most growers of small fruits. The diseasebecomes noticeable as soon as the foliage expands in. FIG. 47. ORANGE RUST. a, Under surface of Ijlackberry leaf showiuLf si)ots of pecidium sta^e; 6, same ofraspberry leaf showing both secidium and Puccinia spots. spring, aifected leaves having a peculiar golden color,which at once distinguishes them. A little later thesurface becomes more or less covered with small roundpatches of orange-colored spores, to which the commonname is due. The life-history of the fungus has onlyrecently been definitely worked out. The fungus exists on the blackberry plant in twovery different stages. The orange spores that are devel-oped in spring and early summer, as shown in Fig. 48,belong to the CBcidium stage. They germinate on the 102 FUNGI AND rUNGICIDES leaves of raspberry and blackberry; the germinatingtubes enter the stomata, or breathing pores, of the leaf,develop a mycelium inside, and finally produce on thesu
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
