PAPERS ON BIOLOGY AND AGRICULTURE 133 



he names Septoria callistephi. He "writes in regard to 

 the disease : 



** Certain commercial plantings of the china aster, 

 Callistephus chinensis, in New York have been severely 

 attacked by Septoria callistephi n. sp. The disease was 

 first observed in 1915 and again in 1919 and 1920. In iin- 

 sprayed plantings, all of the plants of some of the sus- 

 pected colored varieties were killed. The white varieties 

 appear less attacked, and Semple's White Branching, 

 while not entirely immune, is resistant. The pycnidia are 

 found in the scurf covering the seed and the disease is 

 spread in the seed bed. The lower leaves are first dis- 

 eased but later the upper leaves and floral parts are at- 

 tacked. The tawny colored spots may be isolated but, 

 finally, unite and kill the entire leaf. The plant becomes 

 dwarfed, the size of the fiower reduced, and the time of 

 blooming is delayed. The exact control measures have 

 not been fully worked out, although it appears to be 

 amendable to treatment hj seed disinfection and spray- 

 ing with Bordeaux mixture. ' ' 



Prof. Gloyer has kindly examined the material col- 

 lected in Illinois and states that it is identical with his. 

 He further states that a bulletin on this disease is in pro- 

 cess of preparation and will soon be forthcoming (Ge- 

 neva, New York Experiment Station.) 



The importance of selecting seed from plants known to 

 be free from the disease is emphasized by Gloyer 's ob- 

 servations, and commercial groAvers should either pro- 

 duce their oa\ti seed in disease free beds or secure seed 

 from sources where this disease does not occur. 



SEDUM 



Leaf spot of Sedum spectahilis {Septoria Secli West). 

 A bed of Sedum spectahilis in the University ground 

 showed a disfiguring leaf spot in the fall of 1921. Upon 

 examination this was found to be due to a Septoria. 

 Three species of Septoria have been listed on Sedum piir- 

 puream {S, Telephium), Septoria Sedi. West., S. Telepliii 

 and S. sedicola Peck. Two of these, S. Sedi and S. sedi- 

 cola, are reported from America. These two species 

 cause spots identical in character and differ in such 



