DISEASES OF PLANTS. 239 



preventive treatment solutions of potassium sulphid, copper sulphate, 

 and Bordeaux mixture were tested and at "lifting" time tlie percentage 

 of rusty plants on the different plats was 43^, 42, and 100, respectively. 



The author recommends the growing- of varieties least subject to rust 

 and spraying all plants once a week with a solution of coi)per sulphate 

 (L* lbs. to 45 gal. of water) or potassium sulphid (1 oz. to 1 gal. of water). 

 Before bringing in plants in the fall all houses should be thoroughly 

 fumigated, and careful greenhouse management will aid in controlling 

 or preventing rust attacks. 



Treatment for potato diseases, S. B. Green {Minnesota Sta. Bui. 

 45, pp. 307-313,Jigs. 2). — A report is made on potato scab, internal brown 

 rot, and potato blight. For the scab the corrosive sublimate treatment 

 was tried, and it greatly reduced the amount of scab on treated plats 

 over plats where the seed tubers had received no treatment. The soil 

 in whicli the ])otatoes were grown had never grown them before, and 

 the infection must have come from the seed tubers. 



The internal brown rot did not appear as troublesome as during the 

 previous year. A crop grown from diseased tubers showed no indica- 

 tion of the disease until late in the winter, while the potatoes were in 

 storage. Such tubers should not be employed for seed. 



A report is given of experiments conducted with liordeaux mixture 

 for the prevention of potato blight. From 1 to 4 applications were 

 given, and based upon the experience of the past 2 years the author 

 says that little if any increase due to the treatment was observed. 



A spot disease of barley leaves, Steglich (Scichs. landiv. Ztschr., 44 {1S9G), Xo. 32, 

 pp. 397-399, fi(is. 3). 



Investigations on potato scab, Fraxk and Krcger (Ztsclir. Spiritus Ind., 1S96; 

 abs. in Ztschr. Pjianzcnkrank., 6 (1S96), No. 3,pp. 1S9-191). 



The yellowing of sugar beets, J. Froude {Sucrerie indig., 4S {1896), Xo. 13, 

 j)}) -338-340). — A preliminary report is given on a trouble of sugar beets whicli seems 

 to be of physiological origin. It causes a marked reduction in the yield and sugar 

 conteut of the beets. 



On the variety of rust affecting Australian w^heats, J. Eriksson (Ztschr. Pjlan- 

 zenTiraiik., G (1S9(>), No. 3, pp. 141-144). — The author states that the most common rust 

 on Australian wheats is Piiccinia dlspersa, P.graminis occurring sparingly and /'. 

 glumarum not observed. 



A spot disease of celery (Ztschr. Pflanzenkrank., 6(1896), No. 3, pp. 191, 193). — Notes 

 are given of a Septoria disease of celery. 



Diseases of peach trees (Bol. entomol. agrar. e pat. reg., 3 (1896), pp. 75, 76; abs. in 

 Ztschr. Pflanzenkrank., 6 (1896), No. 3, p. 169). — Notes are given on gumming, leaf curl, 

 and leaf crumpling insects. 



Observations on the control of black rot, A. Larroze (Fj-o^. Agr. et VH.,26 

 (1896), No. 38. pp. 326-329). 



Report of the black rot congress at Ager, L. Degrii.ly (Prog. Agr. et Vit., 26 

 (1896), No. 38, pp. 317-321). — A brief report is given of the proceedings in "which 

 Bordeaux mixture was shown to be the best means for controlling black rot. 



Notes on the pine-inhabiting species of Peridermiuni, L. M. Underwood and 

 F. S. Earle (Presented before Sec. G of the American Association for the Advancement of 

 Science, Aug., 1896; abs. in Science, n.8er.,4 (1896), No. 91, p. 437). — A revision of the 

 species of the eastern United States is given and the difference in swellings caused 

 by Peridermiuni cerebrum on Pinus twda and P. echinata was pointed out. 



