120 BULLETIN 624, IT. S. DEPARTMENT OF AGRICULTURE. 



The most valuable strain of this variety is the Valencia. Some 

 other strains may be of value under certain conditions. 



Trees of the Valencia strain are most productive and bear the 

 largest quantities of the best-grade fruit and the most valuable 

 sizes for commercial purposes. 



Trees of the Valencia strain produce fewer variable fruits than 

 those of other strains. 



All the strains described can be isolated through bud selection 

 based on individual-tree performance records. 



Healthy trees of undesirable strains in established orchards can be 

 top-worked and their value improved thereby when fruit-bearing 

 bud wood from selected trees of the Valencia strain is used for this 

 purpose. A practical method for locating such trees and bud wood 

 and a discussion of their treatment in commercial orchards are pre- 

 sented in Farmers' Bulletin 794 of the United States Department 

 of Agriculture, "Citrus-Fruit Improvement: How to Secure and Use 

 Tree-Performance Records." 



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