l"-0] DISEASES OF PLANTS. 349 



It is recommended that the trees shouhl ho sprayed four times with a 

 3:5:50 Bordeaux mixture, applied at intervals of 2, 4, 6, and 10 weeks after 

 the petals have fallen. In order to spray the trees satisfactorily a workhij: 

 l)ressure from 2(X) to 300 lbs. per square inch is considered desirable. The 

 author recommends the iirunlnj? and thinniiif^ out of the trtn's l)efore spraying, 

 and where the trees have been weakened by lilotch to fertilize about the trees 

 with altout 5 lbs. of nitrate of soda when tlie blooms are in tlu- pink. 



The brown rot of stone fruits, W. A. McCuhiun {I'cnn. Dei)t. Agr. Bur. 

 riuiit JiKlus. Circ. 3 (1020), pp. 8, figs. 7).— It is estimated that brown rot 

 < a uses 15 per cent loss annually to the peach crop in Pennsylvania, amounting 

 lo half a million dollars. The same rot in che.ri*ies causes an even greater loss. 

 IMums also are affected and are protected by the same measures as are out- 

 lined for peaches. 



Cure of brusone in the Japanese medlar, I^. Savastano (72. ^taz. ^per. 

 Agrumie. e Fruttic. Acirenlc, Bol. 2i) (1917), pp. 6, figs. 2). — An account is given 

 of brusone due to Fusarium pirinum in the Japanese medlar, and of its suc- 

 cessful treatment with lime-sulphur. 



Further experiments against brusone of the Japanese medlar, L. Savas- 

 tano (R. Staz. Sper. Agfumic. e Fruttic. Acireale, Bol. 33 (1918), pp. 2). — This 

 is an account of experimentation continuing that noted above, employing lime- 

 sulphur at different seasons and concentrations. 



Cure of Oidium of peach, L. Savastano (li. Staz. Sper. Agrumie. e Fruttic. 

 Acireale, Bol. 31 (1917). pp. 2). — Results are given of experiments in the south 

 of Italy on the control ttf Oidium leucoconiuni of peach by means of a pre- 

 ventive application of lime-sulphur. 



Diseases and insect pests of currants and gooseberries, A. Frank (Wash- 

 ington Sta., West. Wash. Sta. Mo. Bui., 8 (1920), No. 2, pp. 29-31, figs. |)/— « 

 Brief notes are given on fungus diseases and insect pests attacking currants 

 and gooseberries, with suggestions for their control. In connection with the 

 control of plant pests, the author calls attention to the different forms of lime- 

 sulphur now upon the market and the necessity for following directions for the 

 usp of the different compounds. 



Deformation of inflorescences of Theobroma cacao and T. bicolor, under 

 the influence of Marasmius perniciosus, G. Stahel (Ann. Jard. Bot. Buiten- 

 sorg, 2. ser., 15 (1918), pt. 2, pp. 95-114, pls. 8). — An account is given of the 

 nuilfomation known as Kriilloten in T. cacao and T, hicolor associated with 

 the presence of .1/. perniciosus. 



History of citrus canker in Australia, with a brief account of the occur- 

 rence of the disease in the United States of America and South Africa, 

 G. F. Hill (Bui. North. Ter. [Aust.], No. 18 (1918), pp. 8, ph. .'?).— (Mtrus 

 canker (Pseudomonas citri), said to have been noted as occurring in Japan, 

 China, Java, Singapore, five American States (Alabama. Florida, Louisiana. 

 Alissi-ssippi, and Texas), the Northern Territory of Australia, and Scmth 

 Africa, is said to be controllable in the last-named region, owing to favoring 

 climatic conditions, by the thoi'ough and systematic use of Bordeaux mixture 

 (4:4:i')0), but tcj require generally, in more humid regions elsewhere, complete 

 extirpation l)y tire of infected trees. Condensed details and a bibliography are 

 given regarding the history of the disease. 



Methods of handling tree wounds, A. N. Duke (Citrus Indus., 1 (1920), No. 

 .'). pp. 10. 15). — Principles and processes are discussed as applicable to the 

 prevention of further injury to citrus and other trees resulting from wounds 

 differing as to causation and situation. The general plans involved are 

 thorough cleansing away where possible of dead or infected material and treat- 



