48 



INJURIOUS INSECTS OF 1904. 



conditions, the gardener is urged to write to the Entomologist 

 when in doubt; the latter will give all information in his power 

 when called upon. The key has been based upon one compiled 

 by Mr. Lochhead in the Thirty-fourth Annual Report of the En- 

 tomological Society of Ontario, but changes have been made in 

 the shape of eliminations and additions to make it fit Minnesota 

 conditions. The writer has seen fit to add melon, cucumber and 

 squash insects, which are naturally of interest to market gardeners, 

 and to give, at the conclusion of the key, for the benefit of the 

 same class of agriculturists, a combined treatment for melon blight 

 and for insects feeding upon the leaves of this plant. 



INSECTS AFFECTING RASPBERRY AND BLACKBERRY. 



A. Attacking the Roots and Base of Canes: 



I. Large grub over two inches long, boring large tunnels 

 in the woody portions of main root. The canes sud- 

 denly die. 



GIANT ROOT BORER OR BROAD-NECKED PRIONUS. 



Fig. 26. — Prionus laticollis, Drury. After Riley. 



