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Pear 
Kinman, C. F., and Magness, J. R. 
1940. Pear growing in the Pacific Coast States. U.S. Dept. Agr. Farmers' 
Bui. 1739, 38 pp. 
p. 24: That cross-pollination is advantageous to setting fruit 
of practically all varieties is now generally conceded. Provisions 
for cross-pollination should be made, notwithstanding the fact that 
such varieties as Bartlett, Anjou, and others may, under favorable 
conditions, set fair crops when planted alone. 
One tree is considered sufficient to pollinize eight others 
if bees are provided to carry the pollen . 
Tufts, W. P., and Philp, G. L. 
1923. Pear pollination. Calif. Agr. Expt. Sta. Bui. 373, 36 pp. 
p. 35: Pear fruits resulting from cross-pollination do not 
appear to exhibit the same tendency to fall after the June drop as do 
those resulting from self-pollination. 
Pollinating agencies such as honey bees are necessary to set a 
good crop of fruit. 
Persimmon, Native 
Fletcher, W. F. 
1942. The native persimmon. U. S. Dept. Agr. Farmers' Bui. 685, 22 pp. 
pp. 3-4: The trees are generally dioecious; that is, the 
pollen-bearing and fruit-producing flowers are borne on separate 
trees. The pistillate or fruit-producing flowers are borne singly, 
whereas the staminate or pollen-bearing flowers are generally produced 
in threes. The pollen is very light and powdery, and, a lthough it is 
g9ner ally_dis tr ibuted by bees that frequent the trees in great numbers 
during blossoming time, it can also be carried to great distances by 
the wind. 
Plum and Prune • 
Hendrickson, A. H. 
1918. The common honey bee as an agent in prune pollination. Calif. 
Agr. Expt. Sta. Bui. 291, pp. 215-236. 
p. 236: The results of the two seasons' work seem to warrant 
the following conclusions: 
Both the French and Imperia l _ prunes ma y be aided in setting 
fruit by the use of bees in t he orch ard during the blossoming period , 
provided the trees are in a normal, healthy condition. 
