SHADE TREE INSECTS 143 



Control — Spray trees with arsenate of lead, 3 

 to 5 pounds to 50 gallons of water ; burlap trees for 

 hiding places for larvae and then kill the caterpil- 

 lars ; tanglefoot of use in catching larvae ; treat egg- 

 clusters with crude coal-tar creosote blackened with 

 lampblack to tell what ones have been treated. 



OTHER INSECTS INJURIOUS TO SHADE 

 TREES 



Pigeon horn-tail (Tremcx columba). 

 Maple borer {PlagionoUis speciosns). 

 Elm borer (Saperda tridenfata) . 

 Maple scale (Puhinaria vitis). 

 Leopard moth {Zeiizera pyrina). 

 Locust borer (Cyllene robinicE). 

 Forest-tent-caterpillar (Malacosoma disstria). 

 European elm scale (Gossyparia spuria). 

 Evergreen bagworm (Thyridopteryx ephemerce- 

 formis). 



Spruce gall louse (Chermes ahietis). 



