232 



PESTS OF ORCHARD AND SMALL FRUITS 



Fig. 294. —Adult of the Grape Root- 

 borer. Enlarged to twice natural size. 

 Original. 



two sizes of borers in the 

 roots. When mature, the borer 

 pupates just below the sur- 

 face of the ground. The adult 

 is a clear-winged moth closely 

 resembling a wasp. 



Cultivation in June and July 

 will destroy or bury many of 

 the pupae. Vines should be 

 stimulated liberally so as to 

 withstand attack. Removal 



of the larvae from the roots by hand is sometimes practiced. 



Prionid Borers (Prionus spp.) 



Fig. 295. — A Prionid Borer. Slightly enlarged. Original. 



Large, yellowish- white borers, 

 sometimes 2| inches long, occasion- 

 ally are found working in or on the 

 roots of grapevines, pear trees, and 

 other fruits. They are the larvse of 

 dark brown beetles of the genus 

 Prionus. When working in a large 

 root, the borer often hollows out 

 the entire inner parts, leaving only 

 the shell. Removal by hand is the 

 only known remedy. 



Fig. 296. — Adult of a Prionid 

 Borer, Prionus imbricornis. Origi- 

 nal. 



