. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . 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 arisi
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . 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-. ^»~!!vi ILATK Tir. CEDAR appTjES {Gytn,nosx)oranrfuim clavipes). 38 FUXGI AND FUXGICIDES per. The presence of tlie fungus causes a peculiardeveloj^ment of the cedar leaves, as may be seen by ref-erence to Plate III, wliere a normal healthy cedar branchis shown at B, and a diseased one at A. The affectedbranch not only has the ^apples developed, but theleaves are entirely changed in shape. Reproductivespores are produced from these ^apples; they ger-minate in a way illustrated at C, and are blown about bythe wind. AVhen one is carried to an apple leaf whereconditions favorable to germination are present, it may
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
