158 



MONTANA EXPERIMENT STATION. 



THE APPLE TWIG-BORER, i. 



The apple twig-borer also known as the grape cane borer is an 

 enemy to the grape, apple, pear, peach, plum, forest and shade trees, 

 and ornamental plants. It is especially destructive to the grape. 



This has been a very common and destructive pest in the states 

 along the Mississippi river from Iowa southward. It also occurs 

 eastward from the Mississippi river to the coast. 



In the fall and winter the adults of this insect bore into the twigs 

 oi its host plants as shown at "d" of the accompanying figure. 

 Entering these stems the beetles hibernate there. It is thus seen 



Fig. 7. The Apple Twig-borer: a, beetle, dorsal and lateral v'.ew. b, pu- 

 pa from beneath; c, larva from side, with enlargements of the thoracic feet; 

 d, burrow in apple twig made by adult; e, larval gallery in tamarisk, with pu- 

 pa in cell at end; f, injury to young shoot and cane, showing the entrance to 

 burrow of beetle near f and the characteristic wilting of the new growth — all 

 much enlarged except d, e and f. (Marlatt, Yearbook, U. S. Dept. of Agr. 

 1895.) 



Amphicerus bicandatus. 



