. Biltmore lectures on sylviculture . ,pp. 51-58; also in oak and hemlock and beech -f *(For. Bull. 51, p. 31) as a saprophyte on ties. -VI. Polyporus rimosus causes the yellow rot of black locust, in its heartwood. Holes made by locust borers (Cyllene robinice) serve as entrances.(Agric. Year Book 1900, p. 207); Contr. Shaw J] LJhSchool of Botany, No. 17; Bureau Plant Indus- Jtry Bull. No. 149, p. 45. 4f ■■>■ ■ VII. Polyporus schweinitzii causes the butt rot, groundrot or root rot of all conifers, notably ofDouglas fir and hemlock. Fungus enters at thebase of the tree through insect mines.
. Biltmore lectures on sylviculture . ,pp. 51-58; also in oak and hemlock and beech -f *(For. Bull. 51, p. 31) as a saprophyte on ties. -VI. Polyporus rimosus causes the yellow rot of black locust, in its heartwood. Holes made by locust borers (Cyllene robinice) serve as entrances.(Agric. Year Book 1900, p. 207); Contr. Shaw J] LJhSchool of Botany, No. 17; Bureau Plant Indus- Jtry Bull. No. 149, p. 45. 4f ■■>■ ■ VII. Polyporus schweinitzii causes the butt rot, groundrot or root rot of all conifers, notably ofDouglas fir and hemlock. Fungus enters at thebase of the tree through insect mines. Treesdie in patches; sporophores are short-lived.(Bull. For. 33, p. 15; F. & I. 1902, p. 61; Book 1900, 203 and 206, and plateXXIV).VIII. Polyporus fraxinophilus occurs in white ash havingover seven inches The hypha; seem toenter by the water niches left by broken becomes straw colored. Very Bull. 32 and Bull. 149, page 46, ofBureau of Plant Industry. 122 X. XI. XVII. XVIII. p /IX. FOREST PROTECTION Polyporus nigricans attacks beech, birch and poplarin the New England States causing standingtimber to rot. (Agric. Year Book 1900, p. 207;Bulletin Bureau Plant Industry No. 149, p. 42). Polyporus sulfureus causes the brown rot of manyconifers, also of oak, walnut and cherry. ( Plant Industry No. 149, page 37; Book 1900, p. 207). Polyporus igniarius occurs everywhere on beech andoak. (Agric. Year Book 1900, p. 207; BulletinBureau Plant Industry, No. 149, pp. 25 to 37). Polyporus libocedris causes the peckiness of baldcypress and the pin rot of incense cedar. Thepecks consist of disconnected holes (or pockets)about 4 long ending abruptly and partiallyfilled with brown powder. Found in trees over100 years old. Reference: Contr. Shaw Schoolof Botany, No. 14. Polyporus pinicola. Western conifers, four years afterdeath, are found entirely destroyed by Poly-porus pinicola. Reference: F. & I., 1902,
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