BACTERIAL DISEASES OF PLANTS 



FIG. 323. Tumor-strand of crown gall in Paris daisy. The result of a pure- 

 culture inoculation. Cross-section of stem between a primary stem-tumor 

 (caused by needle pricks introducing Bacterium tmticfucii-ny) and a secondary 

 tumor in a leaf. It shows a tumor-strand in the inner wood and beyond it 

 normal wood (above) and normal pith (below). 



