GRAPE-LEAF SKELETONIZER 



163 



when full grown. When their growth is finished, they become 

 yellow, with a transverse row of large spots on each segment, and 

 are slightly hairy. 



In late summer, when ready to transform, they disperse. 

 Each seeks a sheltered spot, where a tough, oblong cocoon is con- 

 structed, in which the caterpillar changes to a shiny brown pupa 

 for the winter season. 



The adult emerges the following spring. This insect has proba- 



Fia. 179. Two sphinx moths which are enemies to grapes: above, Ampelophaya my run a,iiJ 

 pupa; below, Deilephila lincata and larva. (After Lugger.) 



bly two broods in some sections. The female moth is about one- 

 half inch long. It is bluish to greenish black, with an orange- 

 colored collar. Its flight is slow and unsteady. Eggs are deposited 

 on the outer side of leaves. 



Injury. The caterpillars eat the soft tissues of the foliage, but 

 not the veins. As they grow, the smaller veins are eaten, leaving 

 only the larger ones not attacked. This insect may become quite 

 injurious if occurring in numbers (Fig. 180). 



Control. Hand-pick the leaves on which colonies are feeding. 



