Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . moves about inthe drop of water on theleaf for a few minutes, then comes to a standstill fig. 40. section of leaf showingand germinates by sending mycelium of fungus, magnified. out a little tube—somewhat as a kernel of corn in moistsoil sends out its germinating radicle—and this tubepenetrates the epidermis, or skin of the leaf. Onceinside, the tube continues to grow, pushing about be-tween the cells of the leaf, and forming the mycelium,or vegetative port
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . moves about inthe drop of water on theleaf for a few minutes, then comes to a standstill fig. 40. section of leaf showingand germinates by sending mycelium of fungus, magnified. out a little tube—somewhat as a kernel of corn in moistsoil sends out its germinating radicle—and this tubepenetrates the epidermis, or skin of the leaf. Onceinside, the tube continues to grow, pushing about be-tween the cells of the leaf, and forming the mycelium,or vegetative portion of the fungus, which may belikened to the roots of the higher plants. As there islittle nourishment to be obtained between the cells, thismycelium develops minute processes, which push throughthe cell walls and absorb the cell contents. A small sec-tion of an affected leaf, greatly magnified, is representedin Fig. 40, the unshaded double-walled spaces represent-ing the leaf cells, the shaded part between the walls themycelium of the fungus, and the projections markeda, a, the processes, or suckers, that penetrate the 84 FUXGI Ais^D FUKGICIDES After this mycelium has developed in the leaf forsome time, it is ready to j^roduce its spores. Conse-quently it sends out through the breathing pores, orstomata of the leaf, its fruiting branches. These bear upon their tips small ovalbodies, which are tlie of these fruitingbranches are shown in Fig. ^mildew visible to thenaked eye is composed of thesefruiting branches and theirspores. It only develops undercertain atmospheric condi-tions ; so that the myceliummay exist in the aSected partsof the vine for some time be-fore this outward manifesta-tion of its presence the spores above de-scribed, which are jiroducedduring the summer season,and, consequently, are calledsummer spores, there is devel-oped in autumn a differentclass of spores, by which the fungus passes through thewinter. Hence,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
