Biack Rot oF CABBAGE. 
Baccillus campestre (Pam.) Sm. on Brassica oleracea and B. campestris. 
Infection takes place through the water pores of the leaves. The mar- 
gins become affected and later the whole leaf withers and dies from throm- 
bosis, i. e. by the plugging up of the xylem vessels by the bacilli. It has 
been shown while the bacilli will die when exposed from 8-10 days on a 
dry cover glass, they are able to live ten to thirteen months on the smooth 
surface of a cabbage seed, and that they often pass the winter in such a 
position.* 
STEWART’S SWEET CorN DISEASE. 
Bacterium stewartii. Sm. on Zea Mais. 
This is a thrombotic disease of sweet corn that is believed to be dis- 
seminated from year to year chiefly by means of bacteria clinging to the 
seed.? 
a ponding, A — Vitality of the Cabbage Black Rot Germ on Cabbage Seed. N.Y. 
\Prucha,M.J. ) Exp. Sta. Bul. 251, 1904. 
2. Stewart, F. C., A Bacterial Disease of Sweet Corn. N.Y. Exp. Sta. Bul. 139, 1897. 
