DISEASES OF PLANTS. 461 



somewhat similar disease is reported as having occurred in Santa Clara County, but 

 this disease was local and is believed to have been due largely to drought, accom- 

 panied by late frosts. 



Court-noue of grapes in Yonne, G. Chappaz {Prog. Agr. ct Vit. {Ed. U Est), 

 S3 {1902), No. 32, jjp. 173-180, figs. 3). — This disease, which results in a peculiarly 

 stunted growth of vines, was particularly troublesome in the vineyards of Yonne 

 during 1902. No parasite has been identified with the disease, and it made its 

 appearance immediately following a low temperature and hailstorms occurring early 

 in 'May. Certain varieties seem to be more subject to injury than others, and the 

 author believes that the injury is due to the hail and the low temperature. This 

 disease, which has been previously described (E. S. R., 12, p. 260), is briefly charac- 

 terized. During the period reported upon it has proved of very great importance, 

 as most of the grapes which were not directly destroyed by the hail have since suc- 

 cumbed to the disease. No suggestions are given for its prevention. 



An epidemic of brown rot in the vicinity of Paris, M. Molliard {Bui. Soc. 

 Mycol. France, 17 {1901), No. 4, PP- 280-282; ahs. in Bat. Centbl, 89 {1902), No. 11, 

 ji. 308) . — A severe outbreak of brown rot, due to Monilia fructigena, upon apricots, 

 peaches, quinces, and pears is reported, while plums and cherries did not seem to be 

 attacked to any great degree. Inoculations made in April upon young twigs of apri- 

 cot soon produced the characteristic appearance of the disease. The destruction of 

 all mummy fruits and l^urning of dead branches are recommended as means for the 

 prevention of the return of the disease. 



Development of black rot, A. Prcxet {Compt. Rend. Acad. Sci Parish, 134 {1902), 

 No. 18, pp. 1072-1075). — This article is essentially the same as one noted from another 

 journal (E. S. R., 14, p. 369). 



Downy mildew of grapes, Trabut {Bvl. Agr. Algerie et Tunisie, 8 {1902), No. 10, 

 p}p. 238, 239). — The occurrence of the downy mildew on grapes in Algiers is reported 

 and is said to have occasioned considerable loss. The ordinary characteristics of the 

 disease as observed in other countries were not apparent, but microscopic examination 

 showed the presence of the spores of Peronospora. The occurrence of the downy 

 mildew coincided with an attack of l)runissure, which led many to think the diseases 

 were identical. Prompt action is recommended for the prevention of the spread of 

 the disease. 



The treatment of powdery mildew, J. Dufour {Prog. Agr. et Vit. {Ed. U Est), 

 23 {1902), No. 30, j)P- 1^0, 121). — A spraying mixture composed of 100 liters of 

 ■water, 500 gm. of black soap, and 500 gm. potassium sulphid is recommended for 

 spraying upon grapevines for the' prevention of the powdery mildew. 



Rose rust, D. McAlpine {Jour. Dept. Agr. Victoria, 1 {1902), No. 1, pp. 81, 82).— 

 A brief account is given of the rose rust caused by Phragmidium subcorticium, and 

 suggestions given for its prevention. Collecting and V)urnitig of the fallen leaves and 

 the use of the winter spray of a strong solution of copper suljahate, followed during 

 the summer by sprayings of Bordeaux mixture, will protect the plants against injury. 



Septoria disease of carnations, P. Voglino {Staz. Sper. Agr. ItuL, 35 {1902), 

 No. 1, pp. 17-34, pi. 1) . — A description is given of the attack of Sejitoria dianthi upon 

 species of Dianthus. The life history of the fungus is briefly described and the effect 

 upon the host is shown. The fungus is said to live saprophytically upon the dead 

 leaves, and retains its vitality for at least 5 months. A temperature of 25 to 30° C, 

 combined with excessive humidity, is very favorable for the rapid jiroduction of the 

 conidia of the fungus, and for the rapid dissemination of the disease. It is recom- 

 mended that the dried leaves and infected portions of the plant be collected and 

 burned as a precaution against the si)rt'ad of the disease. 



Schizophyllum commune, a parasite of the horse chestnut, F. Gueguen 

 {Bid. Soc. Mycol. France, 17 {1901), No. 4, pp. 283-298, figs. 5; ahs. in Bot. Centbl, 

 89 {1902), No. 11, pp. 307, 308). — The presence of this fungus in a number of park 



