No. i;, Septembek, 1921] PATHOLOGY 149 



ing with Bordeaux mixture (4-4-50) on May 1 and at intervals of 3 or 4 weeks thereafter 

 until dry weather is permanently established. — E. J. Kraus. 



950. Barss, H. p. Grain smuts and their control. Oregon. Agric. Exp. Sta. Crop 

 Pest and Hort. Rept. 3: 197-202. Fig. 60-63. 1921.— General description and methods of 

 control are given. — E. J. Kraus. 



951. Barss, H. P. Onion smut control. Oregon. Agric. Exp. Sta. Crop Pest and Hort. 

 Rept. 3: 187-191. Fig. 5-^-55. 1921. — Experiments with, and recommendations concerning, 

 the use of formaldehyde during seeding are given. — E. J . Kraus. 



952. Barss, H. P. Peach leaf-curl control. Oregon. Agric. Exp. Sta. Crop Pest and 

 Hort. Rept. 3: 145-151. PI. 12-13. 1921. — Notes are given on comparative effectiveness 

 of several sprays containing copper, sulphur, or coal tar derivatives, and the time of applica- 

 tion of spray. Thorough spraying with Bordeaux mixture (C-6-50) any time between 

 December 1 and the first part of February resulted in almost perfect control. — E. J . Kraus. 



953. Barss, H. P., and W. A. Smart. Notes on tests with fungicides. Oregon Agric. 

 Exp. Sta. Crop Pest and Hort. Rept. 3: 167-171. Fig. 4S. 1921. — The discussion relates 

 to (1) preliminary tests with late summer sprays for apple-tree anthracnose, (2) sugar as a 

 stabilizer for Bordeaux mixture, (3) iron sulphide, an effective aid to thoroughness in spraying, 

 (4) dry-lime-sulphur vs. ordinary liquid lime-sulphur. Experimental data are briefly pre- 

 sented. — E. J. Kraus. 



954. Brock, W. S., and W, A. Ruth. Judging a spray by its chemical content. Proc. 

 Amer. Soc. Hort. Sci. 17: 105-lOG. 1920 [1921]. — The authors point out that a spray material 

 should not be judged solely by its chemical content as such important properties as solubility, 

 rate of decomposition, adhesiveness, absorption of components of the spray or its decomposi- 

 tion products, the effect of light, heat, and moisture upon the material and upon the relation 

 of the material to the plant and to the fungus to be controlled may be ignored. Although 

 the Sherwin-Williams Company recommends a dilution for their dry lime-sulphur which 

 yields a spray containing less sulphur than is present in a liquid lime-sulphur generally ac- 

 cepted as controlling apple fungi and San Jos6 scale, the recommended concentration has been 

 found successful in Hlinois during 5 years for controlling apple fungi and in 2 localities for 

 2 years in controlling San Jos6 scale. For dependable results repeated field trials in the 

 immediate vicinity seem to be necessary. — H. W. Richey. 



955. Geschwind. Die in den Schwarzkiefernsaatkampen des Karstes auftretenden 

 schadlichen Insekten und Pilze sowie die Mittel zu ihrer Abwehr. [Insects and fungi in 

 the Austrian pine nurseries of the Karst region and the means of combating them.] Wiener 

 Allg. Forst- u. Jagd Zeitg. 39 : 29-30. 1920. — The chief insect enemies of Austrian pine {Finns 

 austriaca) in the nurseries of the Karst region on the east Adriatic coast are discussed as 

 well as the needle cast disease {Lophodermium pinastri) and the root decay caused by Fusoma 

 parasiticum (Fusarium blasticola) . There are well known ways of combating all of these pests 

 but the author considers only the effect of laying sods, grass side down, between the drills 

 in the seed beds. The system of laying these sods was developed primarily as a means of 

 protection against high winds and drying effects and also as a means of adding humus to 

 the soil. The method has proved of considerable help in checking insect attack. The activity 

 of the root-decaying fungus seems to depend upon air stagnation. The sods allow a much 

 greater circulation of air over the seed beds than when they are protected from drying out by 

 lattice frames or leafy branches spread over the beds. — F. S. Baker. 



956. Holmes, E. M. The silver-leaf disease fungus. Pharm. Jour. 106: 31-32. 1921.— 

 Stereum purpureum, proved by Percival to be the cause of the silver-leaf disease of the 

 plum tree and the Portugal laurel, is described by the author, and directions are given for 

 collecting and burning the fungus, which matures during the late winter and early spring. 



