. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . the net income from a singletreated row was one hundred times as great as from anuntreated row. The Quince Rust Roestelia aurantiaca Young quinces are sometimes disfigured by thepresence of a rust fungus, in the peculiar way repre- senterl in Fig. 24. On some per-son of the distorted surface orangespots eventually appear; they areusually more or less elevated. Fromthem the spores of the fungus areproduced in immense numbers, tobe borne hither and thither
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . the net income from a singletreated row was one hundred times as great as from anuntreated row. The Quince Rust Roestelia aurantiaca Young quinces are sometimes disfigured by thepresence of a rust fungus, in the peculiar way repre- senterl in Fig. 24. On some per-son of the distorted surface orangespots eventually appear; they areusually more or less elevated. Fromthem the spores of the fungus areproduced in immense numbers, tobe borne hither and thither by thewind. A peculiar fact concerningthese spores is that they do not de-velop on the leaves and fruit ofother quinces, but, instead, areonly able to develop upon thebranches of red cedar and low jun-ipei*. Those spores which areblown to these plants under favor-able conditions, j^roduce on them the ^^cedar balls, or^^ cedar apples/ so often noticed. One of these is repre-sented in Fig. 25. On the cedar or juniper other sporesare produced, for the wind to carry back to quince tostart the rust as^ain. Thus there is constantly what is. FKJ. 25. CEDAR BALL. 50 FUXGI AXD FUXGICIDES known as an alternation of the generations of the fun-gus, and two entirely different plants are required forits continued growth. This rust is very similar to that which occurs uponthe apple, discussed on a previous page. One importantpreventive measure consists in the destruction of cedarsand junipers; and, probably, spraying with fungicideswill prove to be another. The Black Rot SpliCEropsis tnalorum The fruit of the quince is subject to injury by sev-eral fungi which cause rot. ^ The ripe rot of apples dueto GlcBosporium fructigenum often attacks them; aspecies of Phoma causes what has been called the ^^palerot, and other fungi occasionally induce decay. Themost destructive of these fruit diseases, however, is theblack rot, which usually appears upon the fruitwhen it is half grown, or larger,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
