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BULLETIN 623, IT. S. DEPARTMENT OP AGRICULTURE. 



in a Washington strain tree is shown in figures 7 and 8. Typical 

 fruits of the limb sports borne by one tree grown from a single bud 

 are shown in Plate XVI. This condition is conclusive evidence 



P64IA-HP 



Fig. 8. — Trunk and main limbs of the tree shown in figure 7. The branch marked with the band of cloth 



is the Unproductive strain sport. 



that the origin of the diverse strains of trees in Washington Navel 

 orange orchards is due to the accidental propagation of limb sports, 

 and it is an important reason for obtaining performance records for 

 use in the selection of bud wood for propagation. 



