WrNGOtrS DISEASES OF tHE OARKAtlON. 



337 



BACTERIOSIS OE CARNATIOIS'S. 



Aside from the rust, no disease of the carnation is 

 more to be dreaded. It appears upon the immature 

 leaves as small, circular and slightly sunken yellowish- 

 white spots; but before the spots appear, by holding the 

 leaves up to the light, minute, translucent dots can be 

 seen. Sometimes watery pimples form, but at "ny rate 



'^»>- . i.[tri.,Tt. 



•M 



FIG. 123. BACTEKIOSIS OP CAKNATIONS. 



the tissues affected soon dry out and sink beneath the 

 surface of the leaf. The spots enlarge and the leaves 

 wither (Fig. 123). 



The " disease " was observed by Prof. Arthur of 

 Purdue University in January, 1889, but it was not until 

 more than a year later that he was able to announce 

 28 



