No. 3, Janttaey, 1922] PATHOLOGY 199 



ers under field conditions. Bordeaux mixture was used throughout the period, the proportions 

 used being 14 pounds copper sulphate and 9^ pounds lime in 100 gallons of water. The field 

 sprayed was divided into 4 plots, one of which was not sprayed, the second sprayed early, the 

 third late, and the fourth both early and late. The early spraying was made about a fortnight 

 after the potatoes were earthed up, usually about the end of June or beginning of July, and 

 the second or late spraying was made 2-3 weeks later. The authors conclude that for the 

 9-year period spraying increased the total yield of all the plots; that one late spraying is better 

 than one early spraying, but that double spraying is superior to either alone. — In every case 

 spraying increased the percentage of sound saleable potatoes. The unsprayed plot yielded 4-2- 

 tons saleable tubers, the once-sprayed plots over 5j tons, and the twice-sprayed plots 5^ tons. 

 The percentage by weight of seed stock in the plots showed a small reduction in the case of 

 sprayed plots, but as the total crop was greater in these, the total amount of seed was slightly 

 greater in the sprayed plots. Spraying reduced the number of small potatoes, which in turn 

 reduced the total yield. The authors claim that their results establish the economy of spray- 

 ing. Diagram 1 represents the effect of spraying on crop yield, and diagram 2 compares the 

 percentage of diseased tubers (average of 4 plots) and the rainfall. — W . Stuart. 



1321. Sanders, George E. Dusting to date in Nova Scotia. Canadian Hort. 44: 1-24. 

 1921. 



1322. Sevbrin, Henry H. P. Practical use of curly leaf symptoms. Facts about Sugar 

 12 : 170-173, 212-214. Fig. 1-25. 1921 .—All of the different symptoms of the curly leaf disease 

 of sugar beets are described, and each symptom is illustrated. — C. W. Edgerton. 



1323. Stevenson, John A. Control of sugar cane mottling disease. Sugar 23: 92-95. 

 1 fig. 1921. — Symptoms of the mosaic disease of sugar cane are described, and theories in 

 regard to its cause discussed. The various organisms found on cane have no connection with 

 the mosaic. The ultimate solution of the mosaic problem is stated to be the use of immune 

 or resistant varieties. — C. W. Edgerton. 



MISCELLANEOUS (COGNATE RESEARCHES, TECHNIQUE, ETC.) 



1324. Angelis d'Ossat, G. de. Calcare e viti americane. [Lime and American grapes.] 

 Atti R. Accad. Lincei Roma Rend. (CI. Sci. Fis. Mat. e Nat.) 29=: 58-62. Ifig. 1920.— This 

 includes a discussion and review of some previously reported work on the relation between the 

 lime present in the soil and the chlorosis of the grape vine. [See Bot. Absts. 7, Entry 2120.] — 

 F. M. Blodgett. 



1325. Caesar, L. Practical hints for the young plant pathologist. [Abstract.] Phyto- 

 pathology 11 : 203-204. 1921. 



1326. Edgerton, C. W. Plant disease investigations at the Agricultural Experiment 

 Station. Univ. Bull. Louisiana State Univ. 13^: 18 p., fig. 1-7. 1921.— Plant diseases and 

 their importance in Louisiana are discussed, and an outline is given of the work that has been 

 and is being done at the Louisiana Experiment Station. — C. W. Edgerton. 



1327. Horn, David Wilbur. Fumigation with formaldehyde — a substitute for the perman- 

 ganate-formalin method. Jour. Indust. and Engineering Chem. 11 : 120-129. 1919. — The use of 

 bleaching powder and formalin in fumigating rooms is proposed, "using C20 g. bleaching 

 powder and 800 cc. formalin for each 1000 cubic feet to be fumigated; as much formaldehyde gas 

 will be thrown off into the room as by the use of 250 g. of permanganate and 500 cc. formalin, 

 and at only ^ the cost." — G. H. Coons. 



1328. Humbert, Ernst E. A chisel forceps. Phytopathology 11: 175. Fig. 1 1921.— 

 It is claimed this instrument will be valuable in cutting and transferring to media bits of 

 diseased wood. — B. B. Higgins. 



BOTANICAL ABSTRACTS, VOL. X, NO. 3 



