BACTERIAL CANKER OF TOMATO I TECHNIC 



209 



FIG. 149. Longitudinal section of a tomato stem showing the phloem attacked by 

 Aplanobacter michiganense and the other tissues free. 



FIG. 150. Cross-section of a tomato stem showing a small group of sieve- 

 tubes attacked by Aplanobacter michiganense and the surrounding tissue free 

 Sieve-plates are visible. 



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