INSECTS INJURIOUS TO THE GRAPE 437 



varieties are affected in West Virginia, including the wild fox 

 grape, Vitis labrusca. It is stated that in the South the Scupper- 

 nong, or southern wild fox grape, is immune from attack. The 

 species has been observed from Minnesota and Kansas eastward 

 through Ohio and Kentucky to West Virginia and North Carolina. 

 The parents of the borers are clear-winged moths nearly 



FIG. 366. The grapevine root-borer (Memythrus polistiformis Harris) : male 

 and female moths on wild lettuce leaf under grapevine natural size. 

 (From Brooks.) 



related to the peach-tree borer, currant-borer, and raspberry- 

 borer. The females are seven-eighths inch long with wings expand- 

 ing 1J inches. They are a dark lustrous brown color, the fore- 

 wings being brown and the hind-wings transparent and bordered 

 with brown. The posterior margins of the second and fourth 

 abdominal segments are orange or lemon-yellow, and there are 

 spots of the same color at the bases of the wings. The males 



