SHADE TREE INSECTS 



19 



off and less pointed than those of the eastern tent caterpillars. Although in this 

 vicinity the species is quite common on sugar maple, oak, birch, and poplar, 

 several other broad-leaved fruit, forest, and shade trees are attacked. Occa- 

 sionally large areas of woodland may be defoliated. 



Control. Lead arsenate as recommended for the eastern tent caterpillar is the 

 most effective method of control for this species. 



Bourne, A. I., and Shaw, F. R. Mass. Ext. Leaflet 167. 1937. 

 Britton, W. E. Conn. Agr. Exp. Sta. Bui. 378:73-74. 1935. 

 Felt, E. P. N. Y. State Mus. Mem. 8(1) :106-1 15. 1905. 



Fall Webworm 



Hyplicmtria cunea Drury 



This is a native insect which is distributed throughout the United States and 

 parts of Canada. There are two forms which are considered by some writers to 

 be two distinct species; while others hold that the two are identical or that one is a 

 variety of the other. The northern form is often designated as H. textor. 



The caterpillars make conspicuous silken webs around the foliage at the ends 

 of the branches in late summer. They feed in colonies on the leaves enclosed 

 in their webs, and as more food is needed, they enclose more leaves. They are 

 often mistaken for eastern tent caterpillars. The tent caterpillars, however, 

 make their webs at the crotches of limbs and branches in the spring, and only 

 return to their webs or tents when not feeding, usually at night and on cool, 

 dark da\s. 



Nest of Fall Webworm on Lilac. 



- The fall webworm caterpillars usually attack only an occasional limb so that 

 the injury is not serious, but the mass of webbed leaves gives a very unsightly 

 appearance to the tree. Entire trees, however, have been known to be defoliated 

 and in such cases damage is serious. The insect is reported to attack 120 kinds of 

 plants, including many broad-leaved deciduous fruit, forest, shade, and ornamental 

 trees and shrubs as well as some flower and vegetable garden plants. 



