120 BULLETIN 624, TJ. 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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