AN ANTHRACNOSE AND A STEM ROT OF THE 
CULTIVATED SNAPDRAGON, 
ANTIRRHINUM MAJUS L.* 
EF. 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 calied anthracnose and 
is caused by a fungus new to science. The fungus is here fully 
described and figured and given the name Colletotrichum antir- 
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 were 
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 
1Read 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. 
