RESISTANT VINEYARDS GRAFTING, PLANTING, CULTIVATION. 139 



and scion roots. If the suckers grow rapidly and abundantly it may 

 be necessary to remove some of them before this. They should not be 

 allowed to grow large enough to shade the graft or to render their 

 removal difficult without injury to the scion. It is best not to touch 



FIG. 27. Old grafted vine on which the scion 

 roots have been allowed to grow. The upper 

 series of roots are all vinifera, only the lower 

 series resistant. This vine was killed by phyl- 

 loxera. 



the scion roots until the middle or end of July, when they should be 

 removed with the same care exercised in the nursery. 



As the graft grows it should be tied up to the stake, otherwise it is 

 liable to be broken off or loosened at the union by the wind or the 

 cultivators. 



Regrafting. Perhaps the most troublesome and unsatisfactory 

 feature of field grafting is the necessity of regrafting a large number 

 of stocks. Though exceptionally as high as 95 per cent of the grafts 

 have been known to grow, the usual number will be between 50 and 

 75 per cent, and even of these some will be weak, owing to incom- 



