80 PATHOLOGY [BoT. Absts., Vol. VIII, 



658. Gloyer, W. O. Effect of straw mulch on potato leaf roll. [Abstract.] Phytopath. 

 10:60. 1920. 



559. Gram, E. Uspulum som Afsvampningsmiddel. [Uspulum as a seed disinfectant.] 

 Ugeskrift Landmaend [K0benhavn] 65:636. 1920. — "Uspulum" (mercuric salt of mono- 

 chlorphenol) has been somewhat overestimated by certain writers and does not in the Danish 

 experiments equal the standard treatments for cereal smuts and barley stripe. The sup- 

 posed acceleration of the germination should be more thoroughly investigated before the 

 chemical is recommended. — Ernst Gram. 



560. Hansen, H. J. Brugen af modstandsdygtige Stammer af Kaalroer og Turnips paa 

 kaalbroksmittet Jord. [Resistant strains of swedes and turnips on club-root ground.] Tidskr. 

 Froeavl [Roskilde] 9: 85-86. 1920. — The author directs attention to the fact that many farm- 

 ers order resistant strains although they may not have club-root in their fields. The resist- 

 ant strains are the highest yielders only on contaminated ground, and should be used only 

 there. — Ernst Gram. 



561. Hopkins, E. F. Overwintering and control of bur clover leaf-spot. [Abstract.] 

 Phytopath. 10:66. 1920. 



562. Keitt, G. W. a preliminary report on apple scab and its control in Wisconsin. 

 [Abstract.] Phytopath. 10: 58. 1920. 



563. KuNSTLER, J. Sur un traitement preventif de I'oidium. [On a preventative treat- 

 ment for oidium.] Oompt. Rend. Acad. Sci. Paris 171: 406-407. 1920.— The dusting of the 

 leaves with flowers of sulfur is recommended. — C. H. Farr. 



564. Martin, William H. Sulfur experiments for the control of potato scab. [Abstract.] 

 Phytopath. 10: 60. 1920. 



565. Spinks, G. T. Spraying trials. Ann. Rept. Agric. and Hort. Res. Sta. Univ. Bristol 

 1919: 43-45. 1919. — Varieties of apples and pears susceptible to scab [Venturia] were sprayed 

 once just before the blossoms opened. Little scab developed on the unsprayed trees. Bor- 

 deaux mixture, copper stearate and Burgundy mixture proved equally effective in controlling 

 the diseases but the latter caused injury to foliage. — D. Reddick. 



566. Stover, W. G., F. H. Beach, and T. H. Parks. Results of spraying the apple for 

 blotch in Ohio in 1919. [Abstract.] Phytopath. 10: 58. 1920. 



567. Temple, C. E. Tomato spraying experiments for the control of Septoria. [Abstract.] 

 Phytopath. 10: 60. 1920. 



568. Villedieu, G. De Paction des eaux meteoriques sur les depots des bouillies cup- 

 riques. [The action of rain water on deposits from copper spraying materials.] Compt. Rend. 

 Acad. Sci. Paris 171: 260-263. 1920. — It is found that zoospores of downy mildew [Plasmo- 

 para viticola] live well in acid media but do not develop in the presence of alkali. It is there- 

 fore desirable to have spraying mixtures such that H2SO4 will not be generated when the 

 sulfur compounds brought down by rain mix with the spray deposits on the leaf. — C. H. 

 Farr. 



569. Walker, J. C. Occurrence and control of black leg of cabbage. [Abstract.] Phy- 

 topath. 10: 64. 1920. 



570. Wester dijk, Johanna. Das Spritzen der Kartoffeln in den Niederlanden. [Spray* 

 ing potatoes in the Netherlands.] Jahresber. Ver. Angew. Bot. 16: 132-138. 1918. — A r6sum6 

 of the present status of potato spraying in Holland. — P. J. Anderson. 



