48 



boar large crops, while mixed orchards in the near vicinity 

 often produce bumper crops. He further states that where 

 orchards are set in small blocks of different varieties that 

 the first and second rows along side another variety bear the 

 larger crops and that the crop decreases toward the center 

 of the block. 



V. R. Garner^of Oregon investigated the sweet 

 cherries in 1911, 1912 and 1913, and reports that of eleven 

 varieties studied Lanbert and possibly Knight may be classed 

 as self-sterile. Wood, Elton, Rockfort and Windson are 

 partially self-fertile and Williamette, Napoleon, Coe, Bing 

 and Black Republican are self-sterile. 



Dr. Whittengof Mo., Prof. Beachgof N. Y., Prof. 

 Sternes, Ga., Prof. Reiner^of N. C, and others have shown 

 through exhaustive trials that a large percent of our grapes 

 are incapable of setting fruit unless cross pollinated. This 

 is especially true of the native- Vinifera hybrids and the 

 Muscadines. 



The general opinion seems to prevail that peaches and 

 European plums are self-fertile. There is little actual data 

 outside of general observation to be had relating to these . 

 two groups of fruits. 



Fletcher reportSgas a result of experimental work and 

 from reports of several hundred fruit growers that of the 

 European plums. Golden Drop, French Prune and Italian 

 Prune are risky being variable in their power to self-ferti- 

 lize. Of the peaches Susquehana is classed with the above 

 varieties of plums, while Gold Drop is classed as self-fertile. 



The effect on the fruit itself resulting from cross-ferti- 

 lization was investigated quite thoroughly by many of these 

 men. Waite and Fletcher agree that the si^e and form of 

 the pear is modified by crossing and that the normal typical 

 fruits and usually the finest and largest specimens even in 

 self-fertile varieties are crosses. Both Waite and Lewis 

 studied the effect of crossing the varieties of apples. Waite 

 found that the unsatisfactory character of the fruits 



1 Ore. Exp. Sta. Bull. No. 116. 



2 Univ. of Mo. Bull. 46. 



3 New Yark Exp. Sta. Bull, 157, 169, 223. 



4 North Carolina Ag. Exp. Sta. Bull. 209. 



5 Cornell Exp. Sta. Bull. 181. 



