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UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



The bunches are thinned at any time after the berries have set and 

 before they have reached one-third their mature size. 



No bunches are removed, but only a certain proportion of the 

 berries of each bunch. The number of berries to be removed will 

 depend upon how compact the unthinned bunches usually become. 



Fig. 33. Bunch of green grapes before thinning. 



In general, it will vary from one third to one half of the total number. 

 The thinning is effected by cutting out several of the side branchlets 

 of the bunch. The branchlets should be removed principally from 

 the part of the bunch which has most tendency to compactness, usually 

 the upper part. The work can be done very rapidly as no great care 

 is necessary in preserving the shape of the bunch. However irregular 



