264 INSECTS AFFECTING SHADE TREES 



Control. Spray infested trees with arsenicals, preferably four 

 or five pounds of arsenate of lead to one hundred gallons of water. 



FIG. 265. Work of bronze birch borer. 



This is practicable if the trees are not too large. Even in the case 

 of large trees, if valuable, bamboo extensions of spraying hose 

 might be handled from raised platforms, 



