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APPLIED ENTOMOLOGY 



grown larva (Fig. 287) is an inch and a quarter or more in length, covered with 

 grayish-white and black hairs. Along the middle of the back is a row of tufts 

 of black hairs and there may also be longer, slender black tufts or " pencils." 

 The insect winters as the pupa under rubbish on the ground, and the moths 

 emerge in late spring and early summer and are yellowish in color, the fore wings 

 sprinkled with brown dots and two brownish streaks. These wings are rather 

 narrow for their length, and somewhat pointed. The hind wings are nearly 



transparent and almost white. The moths 

 spread about two inches. Control is by 

 spraying with a stomach poison as soon 

 as the work of the caterpillars is noticed. 



The Fall Webworm (Hyphantria 

 cunea Dru.). This insect is a pest on 

 shade, fruit, and ornamental trees. 

 It is found everywhere in the eastern 

 United States and as far west as 

 Montana and Texas. In the South 

 and northward about to New York 

 there are two generations each year 

 and a correspondingly greater amount 

 of injury than where one is the rule. 



FIG. 287. FIG. 288. 



FIG. 287. Full-grown Caterpillar of the Hickory Tiger Moth, natural size. (From 

 Britton, Seventh Rept. Ent. Conn. Agr. Exp. Sta. 1907.) 



FIG. 288. Fall Webworm (Hyphantria cunea Dru.), about natural size. (Original.) 



The adult moth (Fig. 288) spreads about an inch, and in the north 

 has pure white wings. Farther south black spots are present on them 

 and this difference has led to the belief, still held by some persons, that 

 there are really two species concerned. The winter is spent as the pupa 

 in the ground, the moths emerging in the late spring and laying their 

 eggs in clusters, often 200 or 300 in number, on the under side of the 

 leaves. These hatch in about 10 days and the larvae pass together 

 to the outer foliage of some branch, where they form a thin white web 

 over the surface, feeding on the leaves enclosed within the web (Fig. 

 289). As the caterpillars grow and consume this foliage, the web is 

 extended to cover more leaves and by the time full size has been attained 

 by the caterpillars, the web may be as large as a bushel basket. The 

 full-grown larva (Fig. 290) is over an inch long, quite hairy but not 



