PLANT BACTERIA, VOL. 2 



BALI1M0BE.WD 



WILT OF CUCUMBER. 



(I) Cucumber leaf from Anacostia, D. C. affected by wilt due to Hacillns tracheiphihis. In the center of the wilted area are 

 old gnawings due to Dulhroliea and from these the mlection is believed to have originated. (2) A cucumber stem from the same field, 

 showing the disease much further advanced, although the stem and base of petioles are normal externally. Figures painted July 6, 

 1893. (3) Litmus- milk-culture of liaoillus iracheiphilus (squash strain) inoculated August 28, 1905. Painted September 23. 

 (4) Uninoculated tube (or comparison. Stem and leaf by D. G. PaBsmore. 



