62 PATHOLOGY [BoT. Absts., Vol. IX, 



observed on the "umthente" grass {Imperata arundinacea) ; two leaf spot diseases, — the 

 ring spot caused by Leptosphaeria sacchari, and the eye spot caused by H elminthosporium 

 sacchari; and 2 stalk diseases caused by Melanconium sacchari, the "rind disease" fungus, 

 and Cephalosporium sacchari. Colletotrichum falcatum has not been observed here. Schizo- 

 phyllum comimine has been found in Zululand on old cane stalks lying on the ground, but 

 never on standing cane. The fungus is common everywhere on old stumps and logs of various 

 trees, and occurs also as a wound parasite of fruit trees. In addition to these diseases caused 

 by fungi, there is a physiological trouble, — the occurrence in the internodes of strips of spongy 

 tissue or cavities surrounded by spongy tissue. The cells of the spongy tissue are dead, 

 filled with air, and no sucrose collects in them. Such spongy stalks are readily attacked 

 by fungi. — E. K. Tisdale. 



410. Anonymous. Wither-tip and brown rot of plums. Jour. Ministry Agric. Great 

 Britain 27: 1142-1145. 6 fig. 1921. 



411. Arnatjd, G. Una maladie bacteriene du lierre (Hedera Helix L,). [A bacterial dis- 

 ease of Hedera Helix.] Compt. Rend. Acad. Sci. Paris 171 : 121-122. 1920. — A disease caused 

 by Bacterium hederae n. sp., is found occurring on the leaves. It may be distinguished from 

 that caused by Phyllosticta by the transparency of the leaf spots. — C. H. Farr. 



412. AsHBY, S. F. Notes on two diseases of the coco-nut palm in Jamaica caused by fungi 

 of the genus Phytophthora. West Indian Bull. 18: 61-73. 1920.— Part 1 of the article deals 

 with a bud rot caused by Phytophthora palmivora. The macroscopic and microscopic charac- 

 ters of the disease are given, as well as results of inoculations from pure cultures. Identi- 

 fication of thepathogene, its distribution, infection, spread, and treatment are fully dealt with. 

 Comparisons are made with other types of bud rot. — Part II treats of a leaf-stalk rot caused 

 by P. parasitica. Notes on the symptoms, etiology and control are recorded. — /. S. Dash. 



413. Chen, Chunjen C. [Some important cotton diseases.] Ko-Hsueh [Science-Publ. 

 Chinese Sci. Soc] 6: 168-175. 1921. [Text in Chinese.] — The cause, symptoms, means of trans- 

 mission, and control of the following important cotton diseases are reviewed: Angular leaf 

 spot, anthracnose, wilt, root-knot, potash-hunger, damping-off, root rot, Diplodia boll 

 rot, shedding of bolls and squares, leaf spot, and club-leaf. — Chunjen C. Chen. 



414. DuFRENOY, Jean. Sur des tumeurs bacteriennes experimentales de I'Epicea. [Bac- 

 terial tumors experimentally produced on Picea.] Compt. Rend. Acad. Sci. Paris 171: 874- 

 876. Fig. 1-3. 1920. — Cambium of the canker may be used to infect a healthy tree. Bacteria 

 found in the cankers are described but are not named. — C. H. Farr. 



415. GiAccoNE, V. Los principales enemigos del vinedo. [The principal enemies of the 

 vineyard.] Defensa Agric. [Uruguay] 1 : 07-70. 1920. — A popular account of the more impor- 

 tant parasitic and non-parasitic diseases of the grape, including Oidium, Plasmopara, "black- 

 rot," chlorosis, and root rot. — John A. Stevenson. 



416. GiRARDi, Jose. La chlorosis de las plantas. [Chlorosis of plants.] Defensa Agric. 

 [Uruguay] 1: 300-302. 1920. 



417. GiRARDi, Josfi. Tumor bacteriano del duraznero. [Bacterial tumor of the peach.] 

 Defensa Agric. [Uruguay] 1: 279-2S1. 1 fig. 1920. — A gall forming disease of the peach said 

 to be distinct from crown gall {Bacterium tumefaciens) is described and attributed to Bac- 

 terium persicae, n. sp. — John, A. Stevenson. 



418. Graebner, Paxil. Lehrbuch der nichtparasitaren Pflanzenkrankheiten. [Text- 

 book of non-parasitic plant diseases.] vii + 333 p., 245 fig. Paul Parey: Berlin, 1920. — 

 In a concise textbook written from the standpoint of both the gardener and botanist, the writer 

 seeks to cover the diseases and weakened conditions of plants brought about by non-parasitic 



