PLATE 46 



A. — Rose cane showing the appearance of the canker caused by Coniothyrium 

 Juckelii. 



B. — A rose stem showing local infections produced by Diaporthe umbrina. 



C. — Culture of Diaporthe umbrina from stage B on a rose stem showing beaks of 

 perithecia. X 20. 



D. — Culture on a rose stem from stage B showing spore masses extruded from 

 pycnidia. 



E. — Pycnospore masses from culture shown in figure C. X 20. 



Photographed by Mr. J. M. Shull. 



