SECTION OF VEGETABLE PATHOLOGY. 855 
the first or ecidio-stage of the fungus, and it is not certain that this 
stage is necessary for its continued propagation. The parasite is 
endophytic, or grows within the tissues of the leaves of the host 
plants, and by the time it has become visible on thembby its produc- 
tion of spores, the body of the fungus has already attained consid- 
erable growth and is beyond the reach of fungicides. We can 
only hope to keep the disease off the trees by preventive applications, 
and in localities where some treatment seems to be imperative we 
suggest spraying the foliage with some of the sulphate of copper 
solutions, eau celeste for example, as being most likely to be protect- 
ive. Very dilute solutions of chloride of iron may also protect the 
trees from the attacks of this parasite. 
(€) BIBLIOGRAPHY. 
Winter: Rabenhorst’s Kryptogamen | Frank: Die Krankheiten der Pflanzen ; 
Flora (Pilze); I; p. 193. II; p. 486. 
Sorauer: Pflanzenkrankheiten; Zweite | Grevillea: Uromyces prunorum; Vol. 
Auflage, IT; p. 226. VALE 5 p;..b2: . 
Trelease : Preliminary List of the Para- | —————— Puccinia prunorum: Vol.I1I1; 
sitic Fungi of Wisconsin. p. 54. 
Peck: Report XXV, 1873; p. 116. ——————. Uromyces prunorum var. 
Arthur: Bulletin of Iowa Agricultural | amygdali; Vol. II; p. 19. 
College, November, 1887 ; p. 159. Fuckel: Symb.; p.650. ; 
Burrill: Parasitic Fungi of Tilinois; I. | Halsted, B, D.; Bull. lowa Agri. College, 
Uredinez ; p. 177. | 1888. 
6.—COTTON-LEAF BLIGHT. 
Cercospora gossypina, Cke. 
(Plate IV.) 
(a) GENERAL OBSERVATIONS, DISTRIBUTION, ETC. 
The disease here named Cotton-leaf Blight is quite distinct from 
the dreaded ‘‘ Cotton Rust” that so often has blasted the hopes of the 
planters, and, in comparison, is of little consequence. Anything, 
however, which may affect a crop of such vast importance, even 
though slightly, deserves consideration. 
A number of fungi are known to infest the living cotton plant, 
but,*so far as we have observed, the one most conspicuous from the 
effects produced is Cercospora gossypina, Cke. This fungus was 
first described by Professor Cooke in Grevillea, Vol. XII (Septem- 
ber, 1883), page 31, from specimens collected in South Carolina and 
distributed by Ravenel.* Excepting that it has been occasionally 
confused with the true Cotton Rust, we do not know that it has re- 
ceived any attention from popular writers. Ravenel knew of its 
occurrence in South Carolina, Georgia, and Florida. The writer has 
observed it in North Carolina and Texas, so that the disease is likely 
to occur throughout the cotton-growing States. 
In a field the disease first appears at points where the soil is damp 
or poorly drained, and the lowermost leaves are generally the first 
to be attacked. Frequent showers or heavy rains are favorable to 
the spread of the malady, and at the time of picking, one will often 
find all the leaves on many plants more or less affected. 
* Rav. Amer. Fungi, No. 583, 
