Pomona College Journal of Economic Botany 



289 



it was liberated, thus necessitating the assistance of some outside agency for fer- 

 tilization. The pollination of the mature pistils with pollen from another flower 

 was attributed to insects. Mr. Wester believed the sterility of the Cherimoya in 

 Florida to be due to a scarcity of flowers and an insufficient number of insects to 

 assist in pollinating them. He further states that "the extraordinary productivity 

 of a few individual trees suggests a change in regard to the pollination of the 

 flowers of these trees, possibly due to synacmy and self-pollination." 



In Madeira and the Canary Islands the cultivation of the Cherimoya is 

 carried on systematically, the trees being pruned and manure regularly supplied. 



Figure 129. Showing what the Cherimoya may be in Southern California. A fine 

 specimen from Hollywood, weighing 18 ounces. 



Diseases 



In California no diseases affecting the Cherimoya have been observed ; if 

 they are present, they do not seriously interfere with growth, and have not been 

 of sufficient importance to become evident. In other countries, however, the tree 

 seems to be subject to certain fungus diseases, probably unknown here. 



