AN ANTHRACNOSE AND A STEM EOT OF THE 

 CULTIVATED SNAPDEAGON, 



ANTIRRHINUM MAJUS L.i* 



F. C. Stewart. 



SUMMARY. 



The cultivated snapdragon suffers severely from a fungous 

 disease in which the stems and leaves are covered with elliptical 

 or circular sunken spots. This disease is called anthracnose and 

 is caused by a fungus new to science. The fungus is here fully 

 described and figured and given the name Colletotrichum ant'ir- 

 rhini. 



In an experiment made on Long Island, plants sprayed once a 

 week with Bordeaux mixture remained entirely free from the 

 disease while unsprayed plants under parallel conditions v^ere 

 completely ruined by it. 



It is recommended that cuttings be taken only from healthy 

 plants and that the plants be sprayed with Bordeaux mixture, 

 commencing as soon as the cuttings are rooted and continuing 

 at intervals of from one to two weeks until the plants are put 

 into the greenhouse in the fall. If later treatments are required 

 ammoniacal solution of copper carbonate should be subsituted 

 for the Bordeaux. The plants should be given good ventilation 

 and the foliage wet as little as possible. 



Stem rot is another fungous disease of less importance. It 

 attacks the succulent shoots causing them to suddenly wilt and 



'Read In abstract before the Botanical Section of the American Associ- 

 ation for the Advancement of Science at the New York meeting, June 26, 

 1900. 



•Reprint of Bulletin No. 179. 



