. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 11. APPLE SCAB SPOTS 28 rUXGI AXD rUXGICIDES Plate 11, which represents the size of dwarfed leaves latein July, as compared with a full-grown one. In suchseasoDs the newly formed fruit is also attacked by thefungus, which shrivels the young apples and causesthem to fall off. Occasionally an entire crop is thusdestroyed. The spores, or reproductive bodies of the fungus,are produced in immense numbers on the blackenedspots on the leaf and fruit, formin
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 11. APPLE SCAB SPOTS 28 rUXGI AXD rUXGICIDES Plate 11, which represents the size of dwarfed leaves latein July, as compared with a full-grown one. In suchseasoDs the newly formed fruit is also attacked by thefungus, which shrivels the young apples and causesthem to fall off. Occasionally an entire crop is thusdestroyed. The spores, or reproductive bodies of the fungus,are produced in immense numbers on the blackenedspots on the leaf and fruit, forming most abundantly dur-. FIG. 12. FRUIT AXD LEAF SPOTTED BY SCAB. ing cool, wet weather. They are carried hither andthither by wind and rain. When they light npon amoist leaf or fruit they germinate, by sending out alittle tube, and thus form a new center of disease. Thespores pass the winter on the bark, twigs, and storedfruit, as well as on the fallen leaves and fruit. Duringthe moist weather of spring they start the disease the injury to the leaves and the destructionof the very vouno- fruit, this disease causes serious losses THE APPLE SCAB 29 by dwarfing and disfiguring tlie apples that A. 0. Hammond, of the Illinois State Horti-cultural Society, estimated the annual loss due to thisdisease in Hlinois alone at $400,000, and other authori-ties have estimated it at from one-sixth to one-half ofthe entire crop. The mycelium, or vegetative portion of the scabfungus, consists of brown-ish cells which developjust beneath the skin ofthe leaf or fruit, but, as arule, do not penetra
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
