A Bacterial Disease of Stone Fruits 



391 











c? 



Fig. 65. — Alexander apricot leaves inoculated with pure cultures of Bacterium Pruni. The growth from 

 a six-days-old-slant Hiss-glucose culture was thoroughly mixed in one hundred cubic centimeters of sterile 

 water and then applied to the leaves by dippinj the fingers into the water and gently rubbing the leaves 

 between thumb and fingers. Inoculations were made on June 29, 1912, and the photograph was made 

 on August 27, 1912 



a, Inoculated with a pure culture obtained from an apricot twig 



b, Inoculated with a pure culture obtained from a nectarine twig 



c, CIteck. Sterile toater was applied to the leaves 



d, Inoculated with a pure culture obtained from a peach twig 



e, Inoculated with a pure culture obtained from a plum twig 



