BUD VARIATION IN THE LISBON LEMON. 65 
bud sticks after they have been removed from the tree and are 
trimmed ready for use. 
While it is possible to practice top-working during quite a long 
season, commercially it is usually done through the months of April, 
Fic. 13.—Unproductive lemon tree of the Villa Franca variety top-worked with fruit-bearing bud wood 
of the Lisbon strain. The nurse limb shown at the left was allowed to remain for one year. The 
photograph was taken two months after the buds were inserted. 
May, and June. In the course of these investigations it has been 
demonstrated that the best results have been secured during May and 
early June. Previous to top-working, the trees should be pruned, so 
137435°—20—Bull. 815——5 
