48 Farmers’ Bulletin 1169. 
In this form it overwinters and the following spring the pale gray 
moth emerges from it. The moths are night flyers and lay their 
eggs on the host plant, one in a place. Two cycles are completed in 
the course of the year in the latitude of Nebraska. 
Remedy.—Spray infested trees with lead arsenate (p. 11). 
Fig. 29.—Spiny elm caterpillar: 7, Cluster of eggs on leaf stem; 8, one egg, much 
enlarged; 9, caterpillar feeding; 10, chrysalis hanging from leaf stem;.1/, butterfly 
with spread wings. Egg cluster and caterpillar on elm twig showing characteristic 
appearance after feeding by the caterpillars. (Felt.) 
SPINY ELM CATERPILLAR.” 
How injurious.—The spiny elm caterpillar feeds on elm, willow, 
poplar, and hackberry leaves. The amount of injury depends on the 
°4 Buvanessa antiopa lL. 
