95 



lie loiiiul iL to be alive, however, alter live weeks on 

 •cheese clolh, wetted in a bacterial suspension. 





<t 





Fiy-. I. 



(a) Pscudomonas citri stained with car- 

 bol fuchsin, (b) stained with Williams' 

 ilagella stain (adapted from Hasse) ; (c) 

 stained with analine gentian violet. 



It has been found that fungi belonging to the genera 

 Phonia, Gloeosporiuni, and Fusarium are associated 

 witli citrus canker. The former alone is notably active 

 in the disintegration of host tissues. This was deter- 

 mined by specific tests for the production of certain 

 enzymes. It was found to be capable of dissolving 

 cellulose, starch, cane sugar and maltose. It is also 

 able to utilize the organic acids of the host as evidenced 

 by a decrease in acid content of tissues on which it is 

 growing. Because of its activity in the disintegration 

 of citrus tissues, of its common association with citrus 

 canker, which fact would liclp in its identification, its 

 probable introduction to the Gulf States with Pscud- 

 omonas citri, and the impossibility of assigning it to 

 species already described, it is regarded as an unde- 

 scribed species and given the name Phoma socia. 



Fig. 2. (a) Pycnidium of Phoma socia, (b) Ger- 

 mination of conidia of Phoma socia, (c) 

 mveclium in old culture. 



