PLATE 47 



Diaporthe umbrina: Results of inoculations 



A. — Control. 



B. — Rose stem showing infection produced by inoculation with stage B; cut rose 

 stems placed in moist atmosphere tmder bell jars in the laboratory. 



C— Control. 



D. — Rose stem showing infection produced by inoculation with stage B; rose plants 

 in the greenhouse. 



Photographed by Mr. J. M. Shull. 



88095°— 19 3 



