35 



made with the object in view of solving this problem.* It 

 has been shown that many varieties, even though they may not 

 be self -sterile, will set fruit better and produce better 

 apples when the pollen from another variety fertilizes the 

 variety in question. Winesap sometimes sets fruit when poll- 

 enized with its own pollen; again, instances are known where 

 large blocks of Winesap trees are barren, presumably, because 

 they are self -sterile, and no other varieties are near 

 enough to furnish pollen. .For these reasons it seems advis- 

 able for the growers to plant two or more varieties. 



Fewer Varieties being Planted . - In order to obtain 

 information on this point the following question was asked: 

 "Are growers using fewer or more varieties than formerly?" 

 Answers to this question are grouped below: 



*Note. In this connection the reader will do well to con- 

 sult the work of the following authors: 



Waite, M. £., Self -sterility in Orchard Fruits. U. S. de- 

 partment of Agriculture, Div- of Veg. Path. Bulletin 5. 

 Pollination of Pornaceous Fruits. Yearbook U. S. Dept. 

 Agr. for 1898, pp. 167-180. 



Fletcher, ti. W., Pollination in Orchards, Cornell University 

 Agr. Exp. Sta. Bulletin 181, 1900. 



Pollination of iiartlett and Kieffer Pears. Annual Rep. 

 Virginia Agr. Exp. Sta. 1909 and 1910, pp. 213-224. 

 Lewis, C. 1. and C. C. Vincent, Pollination of the Apple. 

 Oregon Agrl. Exp. Sta. Bulletin 104: pp. 40. 1909. 



