CONTROL OF INSECTS INJURIOUS TO THE GRAPE 1299 



eggs are deposited under the rough hark of all parts of the 

 vine ahove ground, but usually are more numerous on the eaues. 

 Hatching occurs during August and the young grubs seek the 

 roots. The vast majority of individuals of this species complete 

 their life cycle in a single season, but rarely an individual will 

 require two. years to complete its cycle. 



FIG. 439. FEEDING BY ADULTS OF THE GRAPE ROOT- WORM. 



Control 

 Two methods of control are practical: 



(1) destruction of the 



pupae, and (2) destruction of the adults before they lay their 



Destruction of the Pupae 



During the last cultivation of the season a low ridge is left un- 

 der the vines. This ridge is usually removed rather early the fol- 

 lowing season, hut when the vineyard is seriously infested with 

 11 



