PLANT BACTERIA, VOL. 2. 



PLATE 16. 



Wilt of Cucurbits. 



Hothouse-cucumbers inoculated with Bacillus tracheiphilm Sept. 1, 1894, by direct infection from cut surface of 



diseased stems brought in from a field, bacteria being introduced by needle-pricks on blade of one leaf. 



(i) Plant No. 4. inoculated with white sticky ooze from stem of cucumber. Photographed thirteenth day after inoculation 3 blades 



shriveled, 3 wilting, and 4 normal. 

 (2) Plant No. 8. inoculated with white sticky ooze from a squash-stem. Photographed on thirteenth day when all the leaves had shriveled. 



Photographs about ' natural size. 



