GIRDLING THE MAIN ROOT 



231 



The adult beetle is a general feeder, and sometimes injures shade 

 trees. 



Wild strawberry and the roots of various common grasses are the 

 natural food of the grubs. It is inadvisable therefore to set out plants 

 in ground that has been in sod where examination shows the presence of 

 tliis grub or similar root feeders in numbers in the soil. 



The Cranberry Girdler {Crambiis hortuellus Hiibn.) 



Injury by this species is easily recog- 

 nized, the plants being girdled just below 

 the surface of the sand. The tops show 

 the effects by turning brown and dying. 



Damage is likely to be confined to 

 restricted areas. Flooding for ten days 

 after picking is an effective means of 

 control. 



Fig. 291.— Adult of the 

 Cranberry Girdler. Origi- 

 nal. 



The Grape Root-borer {Memythrus polistiformis Harr.) 



The softer tissues within the roots of grapes 

 are attacked by a yellowish white borer, 1^ 

 inches long when full grown, and somewhat 



Fig. 292. — The Grape Root-borer. Original. 



robust. Infested vines do not usually die, but 

 fail to make thrifty growth. 



Two years are required by the borer to reach 

 maturity, and therefore one will ordinarily find 



Fig. 293. — Pupa of 

 the Grape Root- 

 borer. Original. 



