5 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
450 ; 
extending across each forewing near the middle. They have a wing 
expanse of about 5g inch. The full-grown larva is about 14 inch long, 
and its general color is a dirty olive-green. This species is one of the 
most important insect pests of the pecan in the Southeastern States 
and Texas (fig. 100). 
There may be three or four generations in the Southern States 
depending upon the locality and the season. The winter is passed 
as a partly grown larva in a small case near the base of a bud. Early 
in spring it feeds on the buds and later bores into the tender shoots, 
maturing in May. Larvae of the next generation appear in May and 
I'rcureE 100.—Clusters of nuts infested by the pecan nut casebearer (Acrobusis 
caryae). 
June and bore into and destroy from 2 to 5 of the recently set nuts. 
Larvae of later generations seem to prefer the shucks and usually gnaw 
only through the surface, causing httle damage. Eggs for the last 
generation are usually laid late in July to early in September, and 
the larvae construct their hibernating cases in August or September 
(Moznette et al., 309). 
Acrobasis caryivorella Ragonot is a common species on hickory in 
the Northeastern States, and is recorded west to Illinois and Missouri 
and south to Texas. The moths emerge in June and July. The full- 
grown larva is about 84 inch long. The head and cervical shield are 
blackish, and the body is dark grayish-green. In the spring, when 
it is most noticed, the larva mines the tender shoots and webs together 
the tips of the new growth. It lives in a frass tube, and transforms in 
a large oval cocoon. 
Acrobasis comptoniella Hulst is often common to abundant on bay- 
berry and sweetfern in the northeastern part of the United States. 
