230 



BARK-BEETLES; ENGRAVER-BEETLES. 



Fig. 243. — Scol_\ tus ru^ulosus, Ratz.; a, adult; b, same in profile; c, pupa; d^ 

 larva. After Division of Entomology, U. S. Department cf Agriculture. 



through injury or from starvation, these httle creatures attack it,, 

 and then its doom is sealed, unless vigorous measures are taken 

 at once. Peach trees are especially susceptible to injury, and 

 the gummy oozing from the little holes seems to weaken them 

 so rapidly that they succumb in a short time. 



"It is good practice to keep orchard trees in the best possible 

 health and vigor at all times to enable them to resist naturally 



a 'b 



Fig. 244. — Work of Scolytus rug-ulosus in twig of apple; and to the right, gal- 

 leries under bark; a, a, main galleries; b, b, larval galleries; c, c, pupal cells. After 

 Division of Entomology, U. S. Department of Agriculture. 



