. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . s in the vicinity of apple or peartrees are liable to infestation from them, and vice versa. While it is probable that the use of fungicides willprevent this disease, it usually appears so near the timeof harvest that their application may not be of this kind may be prevented, to a considerableextent, at least, by clean culture,—the destruction ofthe rotting or mummified fruits, by means of which thedisease is propagated. This may often
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . s in the vicinity of apple or peartrees are liable to infestation from them, and vice versa. While it is probable that the use of fungicides willprevent this disease, it usually appears so near the timeof harvest that their application may not be of this kind may be prevented, to a considerableextent, at least, by clean culture,—the destruction ofthe rotting or mummified fruits, by means of which thedisease is propagated. This may often be supplemented THE TWIG BLIGHT 51 to advantage by comparatively late spraying with theammoniacal solution of copper carbonate. An illustrated account of this and other quince fruitrots will be found in Bulletin 91 of the New Jersey Ex-periment Station. The Twig Blight Micrococcus amylovoims Quinces are sometimes attacked by the fire blight,or blight of the pear, discussed on Pages 44 to so attacked turn black and are easily distin-guished. Cutting and burning, as recommended forthe pear, are the best remedial PLATE VI. BRANCHES OF YOUNG PLUM TREE AFFECTED BY BLACK KNOT. FUNGI AFFECTING THE PLUM The Black Knot Plowrightia morbosa No fungous disease of fruits is easier to recognizethan this; the black, wart-like excrescences upon thetwigs and branches of plum and cherry trees are toowell known to the majority of fruit growers. In manyof the older settled portions of the country the diseaseprevails to such an extent, that it has led to the practi-cal abandonment of the culture of these fruits; and asimilar condition is threatened in other localities unlesspreventive measures are vigorously applied. The fun-gus attacks nearly all varieties of wild and cultivatedplums, and most varieties of cherries. During the earlier years of the present century therewas much discussion concerning the cause of black horticulturists contended that it was due to
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
