Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 200 DISEASES OF ECONOMIC PLANTS Since the spores are spread only when they are wet, handling or disturbing the vines in any way while the Fig. 89. Bean rust upon leaf and pods ; note the numerous sori upon both surfaces. After Beach. dew or rain is still upon them should be avoided. Seeds already bearing the fungus, , spotted seeds, should never be planted, since they not only raise sick plants,

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