Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 372 Diseases of Economic Plants ests. In Europe, where it is greatly dreaded, it is customary to prevent its spread by trenching. Groups of infected trees and trees near them may be cut to advantage to protect other trees. Other toadstool fungi that cause root-rot are Cli- FiG. 195. — Log rotted by Polyporus schweinitzii. After von Schrenk. tocybe, Tricholoma, and Septobasidium. Root-rots are also due to other fungi, chiefly the following: Ozonium Root-rot (Ozonium omnivorum Sh.). — Elm, basswoo

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Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 372 Diseases of Economic Plants ests. In Europe, where it is greatly dreaded, it is customary to prevent its spread by trenching. Groups of infected trees and trees near them may be cut to advantage to protect other trees. Other toadstool fungi that cause root-rot are Cli- FiG. 195. — Log rotted by Polyporus schweinitzii. After von Schrenk. tocybe, Tricholoma, and Septobasidium. Root-rots are also due to other fungi, chiefly the following: Ozonium Root-rot (Ozonium omnivorum Sh.). — Elm, basswood, oak, cottonwood, mesquite, china tree, mulberry, apple, and pear are affected by this rot, which has been de- scribed and discussed on page 23.

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