268 



INSECTS AFFECTING SHADE TREES 



The Elm-leaf Beetle. This beetle (Galerucella luteola Mull) 

 is an importation from Europe. It is greenish yellow, with black 

 stripes on the back. The eggs are yellow, bottle-shaped, and are 

 laid on the under side of the elm leaves. The larvae are yellow, 

 with black spots from which project small tufts of hair. Pupation 

 takes place amid grass or litter on the ground under the trees 

 affected. 



Injury. The insect prefers European elms, and has been so 



FIG. 270. The elm-leaf beetle, different stages, details of structure, and injured elm leaves. 

 Hair lines indicate actual size. (U. S. Bu. Ent.) 



injurious to elms in the eastern part of the United States that 

 municipal authorities have been obliged to hire gangs of men to 

 save the trees by spraying (Fig. 270). 



Control. The use of an arsenate of lead spray just as the grubs 

 appear is recommended. 



The Elm Borer. This handsome beetle (Saperda tridentata 

 Oliv.) is grayish above. On each side of the thorax and on each 

 wing-cover is a sub-marginal reddish or yellowish stripe. Fre- 



