. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 13. SCABBY APPLE SHOWINGRUPTUKES IX THE SKIN. 30 FUiTGI AKD rCKGICIDES Literature.—Articles concerning apple scab maybe found in the following publications : Bulletin OhioExperiment Station, IV, No. 9; Report JJ. S. , 1887, pp. 341-347 ; First Eeport WisconsinExperiment Station, 1884, pp. 45-56; Cornell Univer-sity Experiment Station, Bulletin 48. The Powdery Mildew Podosphcera oxyacanthce About midsummer one may often find on the lea
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 13. SCABBY APPLE SHOWINGRUPTUKES IX THE SKIN. 30 FUiTGI AKD rCKGICIDES Literature.—Articles concerning apple scab maybe found in the following publications : Bulletin OhioExperiment Station, IV, No. 9; Report JJ. S. , 1887, pp. 341-347 ; First Eeport WisconsinExperiment Station, 1884, pp. 45-56; Cornell Univer-sity Experiment Station, Bulletin 48. The Powdery Mildew Podosphcera oxyacanthce About midsummer one may often find on the leayesand young shoots of apple, cherry, quince, j^each, and. FIG. 14. SECTIOX SHOWIXG SCAB FUXGUS. ^, spores in position, as developed; B, skin of fruit turned up; C, parenchyma-like cells of the parasite; Z» £>, tissues of the fruit. Much magnified. several other trees, small round whitish blotches of mil-dew, which at first have more or less of a radiated ap-pearance, due to the spreading of the threads. In ashort time many of the spots enlarge so that they run THE POWDERY MILDEW 31 toaetlier: and the mildew often covers the whole surfaceof the leaf, either as a thin coating through which thegreen surface can be seen, or as a thick, felt-like cover-ing, which entirely conceals the leaf surface. This mil-dew is composed of a great number of minute whitethreads, branching in all directions, which form themycelium of the powdery mildew fungus. In the fungiof this group the mycelium is external, t. e., instead ofdeveloping on the inside of the leaf of the host-plant, itdevelops on the outside, and in order to get nourishment
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
