. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF SUGAR CANE 309 Causative Fungus. The disease is due to a very inconspicuous fungus, Cephalo- sporium Sacchari, Bull., of which the slender colourless hyphae penetrate all the tissues of the stem. In the hollow which forms in the centre of diseased canes the fungus collects in a white fluffy mass and there the hyphae bear on short, mostly simple branches, terminal heads of one-celled conidia, variable in size and shape. The fungus can live as a saprophyte on a variety of materials and probably occurs
. Diseases of crop-plants in the Lesser Antilles. Tropical plants; Plant diseases. DISEASES OF SUGAR CANE 309 Causative Fungus. The disease is due to a very inconspicuous fungus, Cephalo- sporium Sacchari, Bull., of which the slender colourless hyphae penetrate all the tissues of the stem. In the hollow which forms in the centre of diseased canes the fungus collects in a white fluffy mass and there the hyphae bear on short, mostly simple branches, terminal heads of one-celled conidia, variable in size and shape. The fungus can live as a saprophyte on a variety of materials and probably occurs in the soil. Symptoms. As seen externally the effects of the disease in India are. Fig. 125 Cephalosporium Sacchari From Memoirs, Dept. Agri., India reported to be very much the same as those of red-rot, namely the drying-up of the leaves, and, finally, of the stems. In the Barbados outbreak it was observed that canes might be attacked rather severely in the lower internodes without the tops being very noticeably affected. As mentioned above, however, the disease in this case seemed to be rather suddenly checked. In Nevis more notable damage was reported. The discoloration seen on splitting the cane differs froni that typical of red-rot, being a more uniform and duller red, tending to muddiness, and without the contrasted white patches seen in red-rot. In the earlier stages the discoloration tends to run in vertical lines. A brown patch on the outside marks where the fungus has killed the underlying tissue. This in the Barbados examples extended from the nodes, and the internal discoloration. 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 Nowell, William, 1880-; West Indies (British). Imperial Dept. of Agriculture. London, West India Committee
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplantdi, bookyear1923
