Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . , left by rainor dew, and sends out a germinating tube which pene-trates the skin of the fruit. Once inside it grows rap-idly, pushing its branches through the pulp in all direc-tions, and thus forming a dense mass of mycelium,which absorbs the contents of the cells, disorganizingthe tissues and causing the so-called rot. The affectedplum at first turns brown in one or two spots; thesegradually enlarge until, finally, the whole plum becomesbrown and *^rotte
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . , left by rainor dew, and sends out a germinating tube which pene-trates the skin of the fruit. Once inside it grows rap-idly, pushing its branches through the pulp in all direc-tions, and thus forming a dense mass of mycelium,which absorbs the contents of the cells, disorganizingthe tissues and causing the so-called rot. The affectedplum at first turns brown in one or two spots; thesegradually enlarge until, finally, the whole plum becomesbrown and *^rotten. When it has reached this stage it a FIG. THE BROWX ROT 57 soon becomes covered with a brownish, or ash-coloredvelvety coating, which consists of vast numbers of mi-nute spores produced by the mycelium of the one of these velvety masses be shaken over a glass^slide, and the slide be put under the microscope, itwill be seen that a great many of the spores have sepa-rated and fallen off, as shown in Fig. 26. The sporesare blown about by the wind, and when one of themlodges on an unaffected plum where sufficient moisture is. FIG. 30. MUMMIED PLUMS. present it starts the disease again. The rotten plumscontinue hanging upon the tree, gradually shriveling up(Fig. 28), until finally they become dry and mummiedhusks, roughened by ridges of the skin, and in this statethey remain on the trees through the winter (Fig. 30).On many of these mummied plums some spores willadhere, even until the following spring, when they-ap-parently have the power of germinating; and in all, ornearly all, of them the mycelium remains in a dormant 58 fu:ngi and euxgicides condition, so that during the warm, damp weather ofearly spring this mycelium is able to produce a new cropof spores. These spores are scattered everywhere, andmany of them develop in the blossoms and young losses are sometimes occasioned bv this kind ofinjury to the blossoms. As soon as the fruit is wellformed it
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
