120 massachusetts horticultural society. 



Some Common Bacterial Diseases of Plants. 



In so limited a discussion no more than the briefest mention of 

 the more common of these diseases can be made. From the charac- 

 ter of the injury to the host I have chosen to classify the diseases 

 mentioned as follows: 

 Blights: 



Fire Blight, of pears, apples, quinces, plums, etc. 



Mulberry Blight. 



Walnut Bacteriosis or Blight, of the Pacific Coast. 



Alfalfa Blight in the Southwest (Colo.). 



Bean Blight of beans and probably nasturtiums. 



Rots: 



Wilts: 



Black Rot of cabbage, cauliflower, and turnip. 

 Soft Rots of various hosts. 



Of turnips, cabbage, cauliflower, etc., described by 

 Harrison of Ontario. 



Of carrots described by Jones of Vermont. 



Of calla lily described by Townsend, U. S. Dept. Agr. 



Of sugar beets described by Metcalf of Nebraska. 



Of onions described by Stewart of New York. 



Wilt of cucumbers, squashes, and melons. 

 Wilt of potatoes, tomatoes, and egg plant. 

 Wilt of sweet corn. 

 Wilt of tobacco recently described from Japan. 



Galls: 



Bacterial gall of the olive and oleander of the Pacific 



Coast. 

 Bacterial root galls or nodules of the legumes. 

 As may be seen I have included in this list the nodule forming 

 bacteria of the legumes. While some may object that these are 

 not diseases since they are distinctly beneficial to the host still it 

 seems to be quite well established that they are true parasites 

 living in and supported by the host plant. That they are in the 

 long run beneficial to the legume results from their peculiar habit 

 of taking up and fixing in their own bodies the free nitrogen of the 

 air which finally becomes available to the host plant upon the 



