84 DISEASES OF DECIDUOUS FOREST TREES. 



Page. 



Stereum frustulosum, cause of decay of timbers, description 60-61 



Sulphur gases. See Gases, sulphur. 



polyporus. See Polyporus sulphureus. 



powdered, for control of mildews 18 



trioxid, injuries to trees near copper smelters 10 



Sulphuric acid. See Acid, sulphuric. 



Sycamore leaf-blight, description, effects, and control 20 



mildew injury 18 



mistletoe injury 15 



Taphrina caerulescens, cause of leaf-blister of oak 21 



Tar-spot disease, maple, description and control by burning dead leaves 19 



Thelephora galactina, root fungus, injury to oaks 24 



Ties, decay caused by Polystictus versicolor, description 53-56 



Tillandsia spp., injuries to forest trees 17 



Timber, broadleaf, sap-rot caused by Polystictus versicolor, susceptibility 53 



cutting season, relation to decay resistance 63 



decay, entrance of fungi, explanation 64-65 



preventive methods 66-67 



drying to prevent decay 66 



piling, precautions 66 



structural, decay, causes, rate, prevention, etc 60-61, 62-67 



Timbers, composite, use to avoid dry-rot 67 



Tinder fungus. See Fungus, tinder. 



Tree diseases, classification 9 



trunks, sounding to detect white heart-rot 26 



wounds, protection to prevent fungous growth 36, 37 



Trees, age at which susceptible to red heart-rot 38 



relation to development of white heart-rot 32-33 



broadleaf, classification as to length of life 62 



decay resistance 62 



fungi causing diseases 25-52 



sap-rot caused by Polystictus pergamenus, susceptibility 57 



versicolor, susceptibility 56 



timber, rate of decay of different woods 56, 58 



dead, growth of fungi 31, 38, 42, 49, 52-61 



deciduous, sap-rots 52-61 



destruction by white heart-rot 33-34 



diseased, removal to prevent spread of fungi 36, 39, 47 



forest, injuries caused by cold, wind, and animals 13-14 



resistance to sulphur-gas injury in Germany 11 



susceptibility to sulphur-gas injury, list 11 



fruit, transmission of fungi from oaks 24 



Trelease, William, reference to work 18 



Tsuga. See Hemlock. 



Tubeuf , Carl von, reference to work 49 



Tulip poplar. See Poplar, tulip, 

 tree. See Poplar, tulip. 



Tuzson, J. , reference to work 61 



Ulmus americana. See Elm. 



Usnea barbata, injury to trees 18 



Valsonectria parasitica, cause of chestnut bark disease 22 



Waite, M. B., reference to work 18 



149 



