- 29 - 
The abse nce of bees i n the orchard may mean a low percentage of 
s et with both of these varieties . 
Hendrickson, A. H. 
1922. Further experiments in plum pollination. Calif. Agr. Expt. 
Sta. Bui. 352, pp. 247-266. 
p. 266: The presence of honey bees materially aided in setting 
heavy crops on the following combinations of varieties: Formosa and 
Wickson; Beauty and Santa Rosa; Diamond and Grand Duke. Observe. Lions, 
furthermore, showed that many other combinations were also benefited 
by these insects. 
Hendrickson, A. H. 
1919. Plum pollination. Calif. Agr. Expt. Sta. Bui. 310, pp. 1-28. 
p. 27: A comparison over a number of years between trees where 
there was an abundance of bees flying and trees where bees were scarce, 
emphasized the desirability of having bees in the orchard. Even self - 
fert i l e varieties were immensely benefited by the presence of bees as 
an agency for distributing pollen . 
Kinman, C. F. 
1931. Plum and prune growing in the Pacific States. U. S. Dept. Agr. 
Farmers' Bui. 1372, 57 pp. 
p . 25 : The presence of bees in the plum orchard at blossomin g 
t ime has been_demonstra t ed to be almost an economic necessity. . . . P oor 
crops or perhaps failures may be expected of self-sterile v arieties 
wh ere no bees are pres e nt, and even with_ self- fert i le varieties the 
presence of bees has caused a decided increase in the crop . 
Strawberry 
Darrow, G. M. 
1937. Strawberry improvement. U. S. Dept. Agr. Yearbook 1937: 445-495. 
p. 455: Pollen is carried by bees and other insects , but it is 
also thrown out of the stamens as the anthers crack open ... or it is 
jarred out and blown by the wind and falls on the pistils. A variety 
having perfect or hermaphrodite flowers can produce fruit when planted 
by itself, but one with pistillate flowers cannot set fruit unless 
p;rfestr f low er ed pla nts _ are ne arby to furnish p o llen through the 
agency of bees or other inserts . 
Tung. See Almond. 
Watermelon 
Goff, C. C. 
1937. Importance of bees in the production of watermelons. Fla. Ent. 
20(2): 30-31. 
