528 





BOTANICAL GAZETTE 



[JUNE 



dates for prunes. Infected spots in all three situations gave 

 typical Alternaria spores similar to those found in pustules. Be- 

 sides this fungus, two species of Aspergillus and one species of 



Fig. 5— Stages in rotting and drying out following attack of Alternaria, Asper- 

 gillus, and Penicillium, showing spots having a water-soaked appearance at Brst. 



Penicillium usually appeared. The 



The method of inoculation con- 

 removal of a block of infected tissue with a flamed 

 scalpel after sterilization of the surface. The fungi appearing on 



sis ted in 



grow 



On old 



