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, i.e., spotted seeds, should never be planted, since they not only raise sick plants,

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, i.e., spotted seeds, should never be planted, since they not only raise sick plants, Stock Photo

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RMT1GT8D–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 Fig. 49. — Quince leaf blight ; twig at right sprayed ; twig at left not sprayed. After Bailey.

RMT1HCY3–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

RMT1HJ9X–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 VEGETABLE AND FIELD CROPS 199 power through the destruction of green tissue. Still greater loss follows from the spread of the disease to the pods as Fig. 88. — Bean anthracnose upon stem and leaves of young plants. After Whetzel. they form, the unsightliness of the spotted pods greatly injuring their salability.

RMT1JGXM–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 420 DISEASES OF ECONOMIC PLANTS Heart rot (Fames Everhartii Ell. & Galloway). — This rot closely resembles that caused by Fomes igniarius. Fig. 180. — Tree weakened by Fomes fomentarius. After Atkinson. Large, rusty-brown, woody sporophores, red-brown below, grow from wounds and bear very small pores.

RMT1HEWY–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 DRUPACEOUS FRUITS 131 Fig. 58. —Peach crown gall. After Hedgcock. applex can be produced by inoculation with Pseudomonas tumefaciens, also that the organisms of the peach, apple, hop, rose, and chestnut galls are interchangeable. It is 1 Hedgcock, G. G., Sci. n. s. 25, 671, April, 1907, and Sci- n. s. 29, 273.

RMT1HP8B–Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 VEGETABLE AND FIELD CROPS 301 and eventually leaves and stalk die, though the stalk re- mains standing with its dead leaves still clinging to it. Fig. 131. — Tobacco plant in early stage of the Granville wilt. Original. At the stage of earliest wilting a section across the stem shows a yellowish discoloration of the woody portion. In

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