46 



ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



spraying. Small trees, struggling for a start, may be benefited by 

 spraying. 



Control Measure 3 (end of circular) after buds are swollen 

 but before new leaves appear in spring. Sprays applied after 

 galls develop are useless. 



Green-Striped Mapleworm, Anisota rubicunda (F.). — An oc- 

 casional pest of maple, the caterpillar of this species consumes 

 entire leaves, and an infestation may defoliate a tree within a 

 short time. The full-grown caterpillar is about 2 inches long. It 

 is yellowish-green in color, has green stripes running lengthwise 

 on its back, spines on its sides, and two horns on its thorax. The 

 adults or moths of this species emerge in early spring from pupae 

 in the soil ; the female lays eggs on leaves of maples. The insect 

 may produce two generations in a year. 



Control Measure 1 or 2 (end of circular) as soon as an infes- 

 tation is discovered. 



Flatheaded Apple Tree Borer, Chrysobothris femorata 

 (Oliv.), fig. 34. — The larva of this common and widely distrib- 

 uted insect attacks a great variety of shade trees and fruit trees. 



Fig. 34. — Flatheaded apple tree borer: A, larva; B, adult, a gray or 

 brown metallic-colored beetle about one-half inch long. (Photographs from 

 United States Department of Agriculture.) 



Almost any tree that is weakened by transplanting or dry weather 

 or is wounded or damaged by sunscald may be invaded by this 

 destructive borer. The adults are flat, metallic-colored beetles, 

 each about one-half inch long. The female lays eggs in cracks 

 and crevices in the bark of a tree ; the young borers that emerge 

 from these eggs have little trouble in boring through and tun- 



