. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 3IO GENERAL PLANT PATHOLOGY sitica, a single downy woodpecker carrying 757,o74 spores.^ Wood- boring insects (Family Scolytid^) of the genera Dendroctonus, Scolytus, Tomicus are responsible agents in the destruction of trees opening up holes through which fungi may .gain entrance. Horses do considerable damage to trees by stripping off the bark with their teeth, and street trees cannot be too soon or too carefully protected from such ravages, for a tulip tree planted in the afternoon in
. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. 3IO GENERAL PLANT PATHOLOGY sitica, a single downy woodpecker carrying 757,o74 spores.^ Wood- boring insects (Family Scolytid^) of the genera Dendroctonus, Scolytus, Tomicus are responsible agents in the destruction of trees opening up holes through which fungi may .gain entrance. Horses do considerable damage to trees by stripping off the bark with their teeth, and street trees cannot be too soon or too carefully protected from such ravages, for a tulip tree planted in the afternoon in front of the house of the writer in West Philadelphia had a strip of its bark removed by the curb- stone horse of a deUvery wagon before nightfall of the same day (Fig. 124). Telegraph wires stretched in every direction rub against the trunks and limbs of trees, and do mechanic injury in this way, but, if the insulation is rubbed off the tree may be badly burned, or even set on fire by the electric cur- rent, especially on rainy days when there is a direct grounding of the cvu:- rent through the water running down the crevices of the bark. Many trees in our cities are planted too close to the curb and the wheels of passing wagons tear off pieces of bark (Fig. 141). Farmers in plowing, hoeing, mowing and cultivating the soil injure the roots and stems of cultivated plants and open the way for the entrance of destructive fungi. The blazing of trees by surveyors, the careless system of lumbering, careless trans- planting of young trees, are fruitful sources of injmy to trees. Careless pruning (Figs. 125 and 126) of trees by inexperienced men, such as was prevalent in Philadelphia before the Park Commission undertook to properly care for the trees, caused the death of many fine shade Fig. 125.—Decay following un- skillful pruning. (Sturgis, W. C, Rep. Conn. Agric. Exper. Siat., pi. Hi, 1900.) • Heald, F. D. and Studhalter, R. Preliminary Note on Birds as Carriers o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1917
