82 Bulletin 393 



TABLE 34. Percentage of Normal and of Defoliated Spurs Bearing Fruit 



second spur had all but two leaves removed; the third spur was entirely 

 defoliated. The defoliation was done before the flowers opened in the 

 spring of 19 16. The set of fruit was determined during late August. 

 Again many spurs were infested with aphids and had to be discarded. 

 The data are recorded in table 35: 



TABLE 35. Percentage of Normal, of Partially Defoliated, and of Com- 

 pletely Defoliated Spurs Setting Fruit 



The figures show that spurs with two leaves set approximately as 

 well as spurs with all leaves. The presence of a small amount of leaf 

 surface apparently offsets the harmful effects of entire defoliation. 



Many spurs set more than one fruit. The percentage of such spurs 

 in defoliated and in check lots is given in table 36. The normal spurs, 

 as might be expected, are more likely to produce two fruits than are defoli- 

 ated spurs. The percentage of spurs setting more than one fruit is three 

 times as great in the case of the untreated spurs as in the defoliated lot. 



196 



