744 EXPERIMENT STATION RECORD. 



On the potato disease caused by Chrysophlyctis endobiotica, E. Zimmer- 

 MANN (Natunv. Ztschr. Foist ii. Lamho., 8 {1910), No. 6, pp. 320-327, figs. 

 2). — The history, taxonomic position, dissemination, characteristics of, and 

 methods of control for this fungus are given. 



On a bacterial disease of the fibrovascular bundles of the Irish potato, 

 A. Spieckermann {Centbl. Bakt. [etc.], 2. AM., 21 {1910), No. 4-9, pp. 205- 

 208). — An account is given of the isolation, inoculation experiments, and cultural 

 characteristics of certain bacteria found in the fibrovascular bundles of the 

 Irish potato vv^hen attacked by a bacterial ring disease which causes a brown 

 discoloration of the fibrovascular bundles. 



Experiments on the control of potato scab, Bernhard {Dent. Landio. Presse, 

 37 {1910), No. 18, pp. 20Ji, 205). — The results are given of experiments on the 

 use of sulphur in combating the potato scab, in which 20 kg. of sulphur per 

 i acre was put on the soil. On the plats treated with sulphur the potatoes 

 were less attacked with scab than on untreated land, but the yield was dimin- 

 ished on account of the dry season. 



It is claimed that the sulphur disinfects the soil, puts it in a better physical 

 condition, causes a quicker and more intensive action of the commercial fer- 

 tilizers applied, makes more available the foodstuffs already present in the 

 soil, and plays a greater role in plant nourishment than has been hitherto 

 ascribed to it. 



Carbolic acid and black scab disease, F. Kitlei" {Gard. Chron., S. ser., 46 

 {1909), No. 1175, p. 362). — It is suggested that if land is treated with a solu- 

 tion of 3 oz. carbolic acid to 4 gal. water before planting, and with 1 teaspoonful 

 carbolic acid to 4 gal. water after planting, the black scab of the potato will be 

 controlled, as this remedy was found effective with certain diseases of the tomato. 



Experiments with potato diseases, 1909-10, G. Seymour {Jour. Dept. Agr. 

 Yictoria, S {1910), No. 6, pp. 360-36'i, figs. 7). — The author gives the beneficial 

 results of treating seed potatoes with 1 lb. of formalin to 40 gal. of water for 

 2 hours before planting as a preventive against a form of scab which is causing 

 serious loss {h of the crop in some instances) to potato growers. This scab is 

 presumed to be caused by the potato nematode. 



Testing potato varieties for late blight, D. McAlpine {Jour. Dept. Agr. 

 rictoria, 8 {1910), No. 6, pp. 358, 3.5.9).— Attention is called to a method of 

 testing under strict quarantine conditions any new variety of potato from a 

 region infected with late blight, by subjecting the tubers for 4 hours to a 

 temperature of from 120° to 122° F., and then growing the treated potatoes in 

 quarantine area for two years. 



The heating destroys the mycelium of the fungus in the potato, and at the 

 same time causes the treated tubers to sprout sooner. 



Trials with Bordeaux mixtures as a preventive of the late blight of the 

 potato, F. K. Ravn {Tidsslv-r. Landbr. Planteavl, 17 {1910), No. 2, pp. 271- 

 292). — After summarizing the i-esults of experiments with Bordeaux mixtui'e for 

 late blight {Phytoplithora infesians) conducted in Europe and America, the 

 author reports the results of further experiments with this spray extending 

 over several years and with several varieties of potatoes in which the usual bene- 

 ficial efl'eets were obtained. 



Experiments with Bordeaux mixture in combating potato blight during 

 1909, M. L. MoRTENSEN {Tidsskr. Landbr. Planteavl 17 {1910), No. 2, pp. 293- 

 S05). — In spraying experiments with Boi-deaux mixture for late blight {Phj/toph- 

 thora infestans), the best results were obtained with 2 sprayings (about July 

 20 and August 20), which increased the average yield of tubers 80 to 90 cwt. per 

 londeland (1.3S acres), the percentage of dry matter 1 per cent, and the average 

 weight of the tubers about 12 per cent when compared with the unsprayed plats. 



