ENGLISH: ILLINOIS TREES: THEIR INSECT ENEMIES 7 



small ash trees so severely that they break and fall. The grub 

 tunnels in many directions, mainly in the sapwood. The adults 

 are beetles, each about one-half inch long. Each has a reddish 

 head, which accounts for the common name, and a V-shaped yel- 

 low band across the wing covers. The female deposits eggs in 

 crevices of bark in early summer. The young larva bores through 

 the bark and feeds on the sapwood. It pupates near the surface 

 of the wood. In June, the pupa transforms to an adult, which 

 gnaws through the wood and bark and emerges. 



Control Measure U (end of circular). 



Ash Borer, Podesesia syringae fraxini (Lug.), fig. 4. — This 

 insect was once considered to be the same as the lilac borer, but 

 it now appears to be different and to be limited to ash and moun- 



Fig. 3. — Red-headed ash borer: A, adults; B, larva or grub; C, adult 

 ready to emerge from its pupal case; D„ furrows made by larvae in sapwood 

 and holes through which adults emerged. 



