. Fig. I";'^. — Usnea barhnta and Ramalitiafraxhica, lichens "growing on branch of api)le-tree. Reduced. they prove injurious to the extent of preventing the bark from performing its functions, and more especially in afford- ing shelter to numerous forms of insect life which are decidedly injurious to vegetation. Lichens and mosses are killed by spraying with strong Bordeaux mixture or with a

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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910