BUD SELECTION IN THE VALENCIA ORANGE 7 
normal limb in that same parent tree has produced only normal 
foliage and normal crops. 
In order to show clearly the instability of the progeny trees propa- 
gated from unproductive parent limbs, the data showing the number 
of fruits borne by the unproductive limbs of the progeny trees have 
been segregated in Table 2 from those showing the production on 
the normal branches in the same progeny trees. With young trees 
it is sometimes impossible to decide definitely as to small differences 
in fruit or foliage characteristics, so that where any uncertainty 
existed no attempt has been made to differentiate the unproductive 
from the normal limbs in the progeny trees until this classification 
could be made without any question of doubt. 
As can be seen from a study of the performance-record data pre- 
sented, the progenies of the parent unproductive branches have 
Fig. 1. — Progeny orange trees of the Unproductive (right) and Valencia (left) strains. 
These were grown from buds from (1) a limb variation of the Unproductive strain and 
(2) the normal part of the same parent tree. They are listed as trees Nos. 12-36 and 
12-37 in Table 2, and fruits from them are shown in Figure 2. University of California 
Citrus Experiment Station, Riverside, Calif., June, 1925 
shown marked unproductive tendencies, a condition of fruiting 
similar to that of the parent limbs. Although seven of the nine 
progeny trees of the Unproductive strain are somewhat broken up, 
as was the case in the parent trees, they are largely unproductive 
except in the case of progeny tree 11-3, where only one limb is 
unproductive and the remainder of the tree is typical of the normal 
productive strain. The unproductive limb in this case is very 
unmistakable in its foliage characters, and during the winter months 
it becomes very chlorotic in appearance. 
The decided tendency of the unproductive and normal progeny 
trees to produce crops typical of the parent trees and of limb varia- 
tions in these trees, as herein shown, constitutes definite evidence as 
to the importance of careful and systematic selection of bud wood 
from superior parent trees in commercial propagation in order to 
perpetuate a productive and desirable fruiting strain. 
