. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 4. SECTION OF POTATO LEAF SHOWING DEVELOPMENT OP MILDEW. project the hyph^e, or fruiting threads of the fungus,which give off branches on which are borne small ovalbodies. The latter are the spores, or conidia, of thefungus. They are the bodies by means of which thefungus reproduces itself, and are developed on theinfested leaves in enormous numbers. These conidia are easily dispersed by slight air cur-rents, and are carried far and wide en the wings
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 4. SECTION OF POTATO LEAF SHOWING DEVELOPMENT OP MILDEW. project the hyph^e, or fruiting threads of the fungus,which give off branches on which are borne small ovalbodies. The latter are the spores, or conidia, of thefungus. They are the bodies by means of which thefungus reproduces itself, and are developed on theinfested leaves in enormous numbers. These conidia are easily dispersed by slight air cur-rents, and are carried far and wide en the wings of the 8 PLXGI AND PLXGICIDES. FIG. 5. POTATO 3IILDEW wind. When one of tliem falls upon a moist potatoleaf it germinates by a very peculiar method : Theinside of the spore is composed of a granular substancewhich at this time divides into several individual parti-cles, that escape through an opening in the smaller endof the spore wall, as seen in h. Fig. a. Each of theseparticles now develops two minute hair-like projections,called cilia, as seen at c, by means of which it swimsaround in the drop of water ; these are called swarm-spores, or a short time theseswarm-spores come toa rest, absorb the cilia,and change from theoval shape to one morespherical (d) \ eachthen germinates bysending out a little a, conidinni; b, same, with contents escaping: rrprminnfino fnhpc, swann spores; d, same, come to rest and ociuiiuu-uiiii^ i>u uc, germinating. Something as a kernel of corn sends out its germinating radicle, as shown inthe two fiofures beside d. In case these swarm-spores germinate on the surfaceof
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
