84 DISEASES OF DECIDUOUS FOREST TREES. 



Page. 



Stereum frustulosum, cause of decay of timbers, descript ion 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 01 



Ulmus americana. See Elm. 



Usnea barbata, injury to trees 18 



Valsonectria parasitica, cause of chestnut bark di.-casc 22 



Waite, M. B., reference to work 18 



149 



