157 
367. Smith, Erwin F. Additional evidence on the communicability of peach yellows and 
peach rosette. Bull. U. S. Dept, of Agric., Div. Veg. Path., No. 1, Washington 
[Dec.], 1891, pp. 65, pi. 39. Comprises the author’s investigations, covering 
a period of three years, into the nature and communicability of peach yel¬ 
lows, and the characterization of a new disease of the peach in Georgia and 
Kansas. Gives series of inoculation experiments with the yellows con¬ 
ducted in Maryland, together with 50 excision experiments in seven differ¬ 
ent orchards, which, in connection with a series of experiments hearing 
upon immunity of the disease, warrant the author in drawing the following 
conclusions: (1) That the disease is contagious; (2) that it may he con¬ 
veyed by seemingly healthy buds when these are taken from diseased trees; 
(3) that only a very small quantity of infectious material is necessary, pro¬ 
vided it be in the form of living cells which can be induced to unite with 
the actively growing tissue of the tree; (4) that the disease has a longer 
period of incubation than has been customary to suppose; (5) that the 
death of the entire tree occurs, ordinarily, only after a very considerable 
period, i. e., several years. The peach rosette, upon which a most successful 
series of bud inoculation experiments is reported, is found to differ from 
the yellows in eight characteristic features. The author’s experiments 
with buds taken from wholly diseased trees and from the healthy side of a 
diseased tree resulted in transmission of the disease in the former case, and 
healthy growths in the latter. The author concludes in regard to this re¬ 
markable disease: (1) That it is virulently contagious; (2) that it may exist 
for a short time in a part of the tree without being present in the rest; (3) 
that it has gained a strong foothold in Georgia and is on the increase; (4) 
that the necessity for prompt concerted action on the part of Georgia peach- 
growers by removal of all diseased trees is very great. (D. G. F.) 
368. Smith, Erwin F. Chemistry of peach yellows. Cult, and Country Gent., vol. 56, 
No. 2021, Albany, Oct. 22, 1891, p.859, | col. Short abstract of paper read 
before the 23d biennial meeting of the American Pomological Society. Re¬ 
ported by T. G. R., giving a few results of treatment by fertilizers. (D. G. F.) 
369. Smith, J. II. A disease of lime trees. Fla. Disp., Farmer and Fruit-Grower, now 
ser., vol. 3, No. 42, Jacksonville, Oct. 15, 1891, p. 827, 1 col. Notes a peculiar 
disease causing blossoms to fall in spring and leaves to become knotty. 
(D.G.F.) 
370. Wiester, W. H. Apricot disease. Pacific Rural Press, vol. 42, San Francisco, 
July 11,1891, p. 28, £ col. Gives complaint of apricot disease known as die- 
back, said by editor to be “an old complaint.” (D. G. F.) 
(See also Nos. 411, 412, 433, 470, and 507.) 
C.—DISEASES DUE TO FUNGI, BACTERIA, AND MYXOMYCETES. 
A.—RELATIONS OF HOST AND PARASITE. 
371. Dangeard, P. A. Note sur les Mycorrhizes Endotrophiques. Le Botaniste, 2 e ser., 
5° fasc., Paris, May 1,1891, pp. 223-228, figs. 8. Discusses in more or less gen¬ 
eral way symbiotic action of fungi and roots of phanerogams, and describes the 
presence.of a species of endotropic Chytridiacese, Cladochytrium tmesipteridea 
n. sp., which the author concludes is probably parasitic in the rhizomes of 
Tmesipteris viellardi, although in some respects apparently in symbiotic rela¬ 
tions with the host. A second species of Mycorrhiza found growing upon the 
same rhizomes the author believes is probably identical with either Wahrlichs’ 
Neciria goroshaukiniana or N. vandce.. He is disposed to consider this latter 
species together with a third fungus found in connection, the name of which 
is not given, as being of use to the plant. The study is made from herbarum 
specimens only. (D.G.F.) 
10788—No. 2-7 
