POMACES .387 



From these experiments, Fletcher recommends (under 

 Virginia conditions, at least) that Anjou, Lawrence, Duchess 

 and Kieffer are desirable varieties to plant with Bartlett, 

 and that Bartlett, Le Conte, Garber, Lawrence, Duchess, 

 Anjou, and Clairgeau are desirable varieties to plant with 

 the Kieffer. 



It is not probable that the same degree of self-sterility 

 for a given variety will prevail under different climatic and 

 soil conditions. Furthermore, it must be held in mind that 

 no immediate effect of strange pollen need be expected in the 

 resulting fruit. 



Dwarf Pears. — The pear is the most common tree grown 

 in a dwarf form in the United States. The usual method 

 of dwarfing pears is to graft them on quince roots, which are 

 very slow-growing. 



In a graft, the two plants retain their individuality to a 

 large degree. However, there are numerous instances cited 

 of the influence of the stock upon the scion, or scion upon the 

 stock. ^ When pears are grafted on the more slowly growing 

 roots of the quince, the stock in this case retards the growth 

 of the pear, and dwarfing results. The common quince 

 used in Angers and the varieties ordinarily dwarfed are 

 Angouleme, Bartlett, Anjou, and Louise Bonne. Dwarfing 

 appears to improve the quaHty of the fruit. 



^ If the common apple is grafted on the wild crab, the fruit of the scion 

 growth is more sour than usual. Late varieties of apple may mature earlier 

 when grafted on early stock. The influence of the scion upon the stock is 

 well shown in the case of grafting the morning glory, an annual, upon the 

 sweet potato, a perennial. In this case, the tuberous roots develop much 

 earlier than usual. A most interesting illustration is the development, in 

 Abutilon, of leaves with white spots (albescent leaves) on a green-leaved scion 

 when grown as a graft upon an albescent stock. 



