382 



BACTERIAL DISEASES OF PLANTS 



involved which suffers most, phloem or cortical parenchyma? 

 Is the cambium also attacked? What is the color of the nner 

 bark in patches of "hold-over" blight? What tissues are 

 honeycombed with bacterial cavities? When the organism 



FIG. 295. A. Fermentation tube of milk containing Bacillus amylovorus. 

 Col. 6, isolation of 1915 from apple. Inoculated August IS, 1919. Photographed 

 Sept. 27. Milk cleared and curd digested in closed end. B. Check tube. 



runs out into leaves what petiolar tissues does it invade? 

 In petioles I have observed it wedging apart cells of the bark 

 parenchyma and also forming cavities in the xylem part of the 

 vascular tissues. 



