. Manual of tree diseases . Trees. POPLAR DISEASES 307 pecially apple, are often attacked when orchards are near forested areas. The maples, especially striped and silver, are commonly attacked when mixed in the forest with beech and aspen. Trees of all ages become infected and it is not imcommon to find ninety per cent or more of second growth trees less than five inches in diameter severely decayed. The form of the fruiting-bodies and the characters of the decay are similar for all the kinds of trees affected. Symptoms. Cross-sections of limbs or trunks affected by the common white wood-rot
. Manual of tree diseases . Trees. POPLAR DISEASES 307 pecially apple, are often attacked when orchards are near forested areas. The maples, especially striped and silver, are commonly attacked when mixed in the forest with beech and aspen. Trees of all ages become infected and it is not imcommon to find ninety per cent or more of second growth trees less than five inches in diameter severely decayed. The form of the fruiting-bodies and the characters of the decay are similar for all the kinds of trees affected. Symptoms. Cross-sections of limbs or trunks affected by the common white wood-rot show that the decay starts in the center of the heartwood and gradually extends outward toward the sap- wood. The outline of the decayed area is never regular and certain annual rings are invaded on one side before they are on the other. The decayed wood is soft and whitish, with but few cracks orfissures. Numer- ous narrow and more or less con- centrically arranged black lines are com- mon in the decayed area. Bordering the white rotted area is_ a continuous black line with a dark-colored zone between it and the normal wood (Fig. 58). The black line marks the region of greatest activity of the advancing mycelium in converting the normal wood into the soft white product of decay. The sapwood and. Fig. 59. — Fruiting-body of Fames Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rankin, W. Howard (William Howard), b. 1888. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
