. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . od of preventing itsinjuries. Treatment.—The first step toward the successfulprevention of this disease is the removal and burning ofthe mummied apples on the trees. This should be doneduring winter. It would be desirable, also, to rake upand burn, or bury, the fallen fruit and surrounding rub- 3G FUXGI AXD FUXGICIDES bish. Then the Bordeaux mixture treatment recom-mended for the preyention of apple scab will have adecided influence in lessening the amoun
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . od of preventing itsinjuries. Treatment.—The first step toward the successfulprevention of this disease is the removal and burning ofthe mummied apples on the trees. This should be doneduring winter. It would be desirable, also, to rake upand burn, or bury, the fallen fruit and surrounding rub- 3G FUXGI AXD FUXGICIDES bish. Then the Bordeaux mixture treatment recom-mended for the preyention of apple scab will have adecided influence in lessening the amount of damage. An account of experiments with this disease may befound in Bulletin No. 44 of the Kentucky AgriculturalExperiment Station ; and of its nature in the 18S9 reportof the same station. It is also discussed in the 1887Report of the IT. S. Dej^artment of Agriculture, andmore fully in the Journal of Mycology, v. VI, p. 164. The Apple Rust Gymnosporangium and Rcestelia A peculiarity of many parasitic fungi is that thecomplete cycle of their existence is not passed upon asingle host-plant, but that, instead, one jihase of devel-. FIG. 19. ^, surface view of pustiile; if, mycelium thread; (J, ^terminating spore. Magnified. opment occurs upon one plant, whiJe another quite differ-ent stage of existence is passed on an entirely differenthost. A striking illustration of this is seen in the case ofthe rusts which sometimes affect apple trees, causing theleaves to become more or less blistered with orange-yel-low spots. In this disease the fungus on the apple is analternating form arising from spores produced by the so-called ^cedar-ap23les, or ^cedar-balls of cedar or juni-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
