126 



Elementary Principles of Agriculture 



makes the new branches grow very vigorously, but, as 

 the fruit in grapes is borne on the new wood, this is 

 very desirable. (See If 157). 



The growth of the vine for the 

 first season after transplanting is 

 cut back to a single shoot, for 

 at least four or five feet. This is 

 tied up to the central wire and 

 forms the permanent stock, or 

 stem. In priming, after the first 

 year, from two to four arms, or 

 branches, are left to produce the 

 bearing wood. The number and 

 length of the arms will vary with 

 the vigor of the plants. Weak- 

 growing vines are usually left 

 with only two or three arms. 

 The most desirable form of grape trellis is that shown 

 in Fig. 76, known as the Canopy, or Munson trellis. 

 This kind of trellis allows more leaves to be exposed to 

 the light, and gives more color and flavor to the fruit. 



Fig. 75. Y-system of pruning 

 and training grapes. 



Fig. 76. Munson system of training 



