121 
are able to mature their seeds, they are frequently internally infected by 
the mycelium of the fungus and thus serve to carry the disease from sea- 
son to season.’, *, * 
RwustvTs. 
It is now believed by some pathologists that certain species of Puc- 
cinia are perpetuated by means of the seed of the host plant. Eriksson, 
after long investigation, came to believe that the fungus exists in the seed 
in a mycoplasmic form which can only with difficulty be detected from the 
protoplasm of the cells in the seed. As the plant grows, the mycoplasm 
spreads from cell to cell, finally appearing as mycelium in the intercellular 
spaces. He believes that the rust may be inherited from preceding crops 
by means of this mycoplasm.* It is generally believed that the facts do 
not warrant the acceptance of this theory. Bolley thinks that infection 
may take place from spores inside the seed itself. He found both uredo 
and teleutospores of Puccinia graminis borne in spore beds just below the 
bran layer of wheat and also found plenty of rust-mycelium within the 
seed Eriksson reports seed infection with Puccinia graminis and P. 
glumarum in wheat, oats, and barley, and P. dispersa on rye. Noack re- 
ports a case from Cooke of carnations being affected by rust which must 
have been caused by seed infection and he himself observed an incident 
of celery-rust that was likewise caused by infection from the seed.° 
ANTHRACNOSE OF TOMATO. 
Colletotrichum lycopercici Ches. on Lycopersicum esculentum.' 
BACTERIOSIS, OR BACTERIAL BLIGHT OF BEANS. 
Bacterium phaseoli Sm. on Phaseolus vulgare.’ 
This disease affects the stems, leaves, and pods (Fig. 7) of various 
field and garden beans, including limas. It spreads through the pods into 
the seeds, where the bacteria live through the winter, thus carrying the 
disease from season to season. 
1. Bolley, H. L., Flax Wilt and Flax Sick Soils. N. D. Bul. 50, 1901. 
2. Bolley, H. L., Flax and Flax Seed Selection. N. D. Bul. 55, 1903. 
3. Bolley, H. L., Flax Culture. N. D. Bul. 71, 1906. 
4. Eriksson, J.. A General Review of the Principal Results of Swedish Research 
on Grain Rusts. Bot. Gaz. XXV; 26; 1898. 
5. Bolley & Pritchard, Rust Problems, ete. N. D. Bul. 68: 1906. 
6. Noack, Fritz, Die Verschlepping von Pflanzenkrankheiten durch Simereien. 
Zeitsch. land. u. ver Hersen, 1893, No. 20, pp. 161-2. Trans. by Prof. H. H. Whetzel. 
7. Harvey, F. L., Tomato Anthracnose. Me. State Coll.;Ann. Rept. 1893. Part II, 
Pp. 152, 
8. Whetzel, H. H., Some Diseases of Beans. Cor. Exp.iSta. Bul. 239, 1906. 
