Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . oned in our horticultural literature, but few im-portant articles concerning it have been published. Thebest popular discussion that has come to my notice is inProfessor Lamson-Scribners excellent little volume onthe **Fungus Diseases of the Grape and Other Plants(pp. 12G-131). The Peach Yellows The peculiar affection of peach trees called the*yellows, has been known to occur in America for atleast a century, and during that time it has ravagedmany of the f
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . oned in our horticultural literature, but few im-portant articles concerning it have been published. Thebest popular discussion that has come to my notice is inProfessor Lamson-Scribners excellent little volume onthe **Fungus Diseases of the Grape and Other Plants(pp. 12G-131). The Peach Yellows The peculiar affection of peach trees called the*yellows, has been known to occur in America for atleast a century, and during that time it has ravagedmany of the fairest orchards of the country. Althoughmost commonly affecting peaches, it also occurs in nec-tarines, almonds and apricots. No disease of fruits has proved so difficult to investi-gate as this. Until very recently there were numberlesstheories as to its cause, but the investigations of F. Smith, to whom we are indebted for much ofthe positive knowledge now possessed concerning it,indicate that it is a germ disease, due, probably, to someobscure bacterium-like organism. h3fcH > ft) > a o w >ft)o Ed ftlo w ftl o CO. 70 FUNGI AXD rUi^GICIDES Peach yellows now occurs over a large portion ofthe States east of the Mississippi Eiver. During recentyears it has destroyed thousands of trees in Michigan,Maryland, Delaware, New Jersey and New York. Symptoms.—According to Dr. Smith, ^Hhe earli-est unmistakable symptom of the yellows is the prema-ture ripening of the fruit. Diseased trees ripen theirfruit, in whole or in part, from a few days to severalweeks in advance of the proper time. Often the peacheson one or two limbs only will be diseased, all the restripening in a normal manner. In such cases the prema-ture peaches are full-grown, ripe, and high colored,when those on the rest of the tree are green and but halfgrown. These peaches, no matter what their naturalcolor, are more or less red and jourple spotted on theskin, and splashed and streaked within. Sometimest
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
