No. 601] BESISTANCE OF PRUNUS TO CROWN GALL 



57 



what out of the natural range of the species. P. hortulana and 

 P. americana are used as a stock for the native plums in the 

 middle west and east. P. hortulana does not sucker, fruits abun- 

 dantly and has a number of excellent qualities that would recom- 



TABLE V 



Summary op Artificial Inoculations on Golden Beauty, Frurwa hor- 

 tulana. Concluded November, 1914 



mend it as a stock. Further experiments with varieties of this 

 species are being made and its adaptability to various of our 

 stone fruits carefully studied. 



LUDED November 15, ] 



Further inoculations of P. pumila (thirteen experiments of 

 ten inoculations each or 130) made during the present year, 1915, 



