June, 1920] IIORTICULTUl: I, 345 



2324. Coons, G. H. Bordeaux mixture. Michigan Agric. Exp. Sta. Quart. Bull. 2: 18-19. 

 6 fig. Aug., 1919. 



2325. Cordley, A. B. Possible causes of "sour sap" in the Pacific Northwest. Better 

 Fruit 13 1: :6, 30-32. May, 1919. — Pathological condition of fruit trees, locally known as 

 "winter kill," "sour sap," or "spring injury" occurs in most of the humid sections of the 

 Pacific Northwest. The greatest injury takes place from a short time before the opening of 

 blossoms to three or four weeks after. The symptoms are: discoloration of cambium, with- 

 ering of leaves, followed by dying of branches or of the whole tree. The writer advances a 

 theory: "Spring injury ("sour sap") is due to acute nitrogen starvation during the most 

 active vegetative period in the life of the tree." Lack of nitrogen in the tree is attributed to 

 leaching of nitrates from the soil and to inhibition of the processes of nitrification. Dis- 

 cussion in support of the theory follows. Remedies suggested are: (1) proper cultivation of the 

 soil to facilitate nitrification or (2) a light application of nitrate of soda shortly before blos- 

 soming time. — A. E. Murneek. 



2326. Curtis, R. H. Report on meteorological observations at Wisley, 1917. Jour. Roy. 

 Hortic. Soc. 43:316-330. 1919. — The fourteenth annual report of meteorological observa- 

 tion at the observatory of the Society. Air and soil temperatures, humidity, rainfall, wind 

 and sunshine records for each month in the year are given. — J. K. Shaw. 



2327. DeOng, E. R. Effect of excessive sterilization measures on the germination of 

 seeds. Jour. Econ. Entomol. 12: 343-345. 1919.— See Bot. Absts. 3, Entry 2913. 



2328. Domingo, M. Gil. El empleo de abonas quimicas en los naranjas. [Chemical 

 fertilizer for oranges.] Informacion Agric. [Madrid] 9:60.-61. 1919.— The use of sodium 

 nitrate recommended at the rate of 1-2 kgm. per tree in two or three applications at 20-30 

 day intervals. — John A. Stevenson. 



2329. Dosch, Henry E. History and development of French walnuts in Oregon. Proc. 

 Oregon Hortic. Soc. 1918: 67-72. 1919. — A brief account cf the history and development of 

 the walnut industry in Oregon. Popular varieties of walnuts now grown in the state are 

 discussed and described in detail. — A. E. Murneek. 



2330. Durham, Herbert E. The Lorette system of pruning. Jour. Roy. Hortic. Soc. 

 43:261-277. Fig. 36-44- 1919. — The method of Lorette for summer pruning apple, pear 

 and other fruit trees is discussed on the basis of observation in the orchard of the originator 

 near Douai, France and from 4 years' experience of the author. The purpose of the method, 

 which is carried out from May to September, is to evoke growth from dormant eyes and to 

 induce increased fruit-bearing near the supporting stems. By cutting back shoots at the 

 proper stage of growth, the formation of fruit spurs is favored and increased production is 

 secured. There is a brief discussion of the nomenclature of fruit-tree parts""and a short 

 bibliography. — J. K. Shaw. 



2331. Eustace, H. J. Horticultural notes. Michigan Agric. Exp. Sta. Quart. Bull. 

 1: 133. Feb., 1919. — Contains a note on fake tree doctoring by special powders placed in a 

 hole bored in the tree. — E. A. Besseij. 



2332. Eustace, H. J., and R. H. Pettit. Spray and practice outline for fruit growers. 

 Michigan Agric. Exp. Sta. Special Bull. 93. 82 p., 6 fig. 1919.— A discussion of the sprays 

 to be used for controlling the insects and fungi of fruits in Michigan, method of preparation, 

 time and manner of application, etc. — E. A . Bessey. 



2333. Gin arte, Benjamin MuSoz. Consideraciones sobre el cultivo de la Pi5a en Cuba. 

 [Cultivation of the pineapple in Cuba.] R ovist, Agric. Com. y Trab. 2: 335-341. 7 fig. 1919. 

 — Historical and descriptive article. [See next following Entry, 2334.] — F. M. Blodgcll. 



