INJURIOUS AND BENEFICIAL INSECTS 



23 



41 Fall web worm (Hyphantria cunea). Web tents in 

 July and August inclosing leaves on the tips of branches, the 

 eaten foliage turning brown. 



This insect attacks many 

 trees and occasionally is very 

 destructive. The parent in- 

 sect is a whitish moth. 



Treatment: destroy webs 

 ^nd their inhabitants or 

 spray foliage of affected limbs 

 with poison. 



42 Bag worm (T h y r i d o p- 

 teryx ephemeraefor- 

 m i s). Defoliated evergreens 

 and other trees are found in- 

 fested in late summer and fall 

 with curious caterpillar con- 

 taining bags of this insect. 

 Occurs in vicinity of New 

 York city and is sometimes 

 very destructive, specially to evergreens. The female is wingless 



and never leaves the bag. 



Treatment: collect and 

 destroy bag worms or spray 

 with poison. 



43 Leopard moth (Z e u- 

 zera pyrin a). The 

 whitish, black spotted cater- 

 pillar of this imported pest 

 makes large burrows in 

 trunks and limbs. It attacks 

 most kinds of trees and 

 shrubs grown about New 

 York city, and has already 

 made its way about 40 miles north. The parent insect is a white, 

 black or blue spotted moth with a wing spread of about 2 inches. 



Fig. 34 Fall web worm: a light form of full 

 grown larva; b dark form of same; o pupa; d 

 spotted form of moth (reduced from Howard, 

 U. S. dep't agr., Yearbook 1895) 



Fig 35 Bag worm: rr, b, c at successive stages of 

 growth; c male, bag; d fr^male bag (reduced from 

 Howard, U. S. dep t agr., Yearbook 189.:) 



