Pamphlets on Forestry in New York, Том 3

abundant antheridium appear arsenate of lead Artotrogus balsamifera bark become beetles branches bronze birch borer buds Bulletin burrow caterpillars Certinensis cities clusters color common cones conidia conidium Coprinus Cornell University cottonwood Cronartium ribicola currants damping decay developed diameter disease egg cell elm leaf-beetle English elms Entomology European aspen Experiment Station foliage forest fruit body fungi fungus germinate ground growing growth grubs Horticulture Husbandry hypha I. P. ROBERTS inches long infested injury insect Ithaca killed larch case-bearer large number larva larvæ leaf leaves Lombardy maple mycelium Nature-Study nearly Norway spruce nursery observed oogonium parasite pest pileus plants Polyporus poplar Populus prothallia prothallium protoplasm pruning red spruce Ribes rust season seed seedlings shade trees side soil species specimens sporangium spores spraying spring spruce stem surface threads timber tissue trunk tube twigs usually white birches white oak white pine winter wood York young zoospores