INJURIOUS INSECTS OF I909 AND IQIO. 103 
FOUR INJURIOUS SHADE TREE AND TIMBER PESTS. 
Maple Borers, Elm Borer (Saperda tridentata), Birch-Leaf 
Skeletonizer, Box Elder Twig Borer, Larch Saw Fly. 
Fig. 50. Elm tree dying from attacks of Elm Borer. Original. 
