Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 102 DISEASES OF ECONOMIC PLANTS tioned, those depending upon electrical or atmospherical influences, freezing of the bark, too long culture of par- Fig. 42. —Pear blight; healthy and diseased twigs. Original. ticular varieties, freezing of the roots, too high culture, insects, fungi, and absence of needed food. One of the

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