Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 364 Diseases of Economic Plants are found in the wood. Death results either from diminu- tion of water supply or from breaking of the trunk. Heart-rot, White wood-rot (Fomes everhartii (E. & G.) Schr.). — This closely resembles the rot produced by Fomes igniarius. Large, rusty-brown, woody sporophores, red-brown below, grow from wounds and bear very small pores. White-rot ' (Poly- porus squarnosus Fr.). — In Europe this rot affects pear, oak, elm, walnut, linden, wil- low, ash, birch, beech, hor
Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 364 Diseases of Economic Plants are found in the wood. Death results either from diminu- tion of water supply or from breaking of the trunk. Heart-rot, White wood-rot (Fomes everhartii (E. & G.) Schr.). — This closely resembles the rot produced by Fomes igniarius. Large, rusty-brown, woody sporophores, red-brown below, grow from wounds and bear very small pores. White-rot ' (Poly- porus squarnosus Fr.). — In Europe this rot affects pear, oak, elm, walnut, linden, wil- low, ash, birch, beech, horse-chestnut, and maple. In America it has been reported from Minnesota. The wood becomes unusually white and bears scat- tered series of white lines. The nearly circular fruiting bodies are stalked and often at- tain a diameter of 15 cm. When young, they are soft, but later become very scaly and rough. Gill.).—This rot Fig. 191. —• Fomes fomentarius showing hoof-shaped sporophore. After Atkin- son. tough. The upper surface is Sapwood rot (Fomes fomentarius abounds throughout the northern part of the United States, as one of the most common diseases of deciduous trees, chiefly affecting the beech and birch. Decay begins in the outer sapwood and proceeds in- ward. The wood is marked by irregular black lines, the boundaries between diseased and normal wood. When en-
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