PLANT BACTERIA, VOL. 2. 



PLATE 14. 



Wilt of Cucurbits. 



Cucumber-plants inoculated with B. tracheiphilus in summer of 1903 (hothouse, U. S. Department of Agriculture, 



by James Birch Rorer). 



Infections were by means of needle-pricks, using pure cultures. In each case needle-pricks were confined to a single leaf-blade. This blade 

 first wilted and then gradually all the other leaves. Inoculations were made on July 23 and photograph about 18 days later. Much 

 reduced. 



