DISEASES OF PLANTS. 149 



Finger-and-toe of crucifers and a disease of carrots, P. Passy {Jour. Agr. 

 Prat., n. ser., 21 (1914), No. 3, pp. 87, 88).— Referring to the reports above 

 noted, the author cites a case of spinach decreasing in returns since 1911. 

 Plasniodiophora brassicce had not been known in these plats pi-eviously, and no 

 injury to the roots was apparent. The loss is considered due to some cause not 

 yet determined. 



Finger-and-toe disease in Brussels sprouts (Worcester Co. Expt. Gard., 

 Droitwich, Ann. Rpt. 1012; abs. in Jour. Bd. Agr. [London^, 20 {1914), No. 11, 

 p. 1010). — Land that finger-and-toe disease had I'endered useless for growing 

 Brussels sprouts before 1903 was subjected for five years to tre.Mtment with gas 

 lime, quicklime dug in, or quicklime left on the surface. In 1911 plats receiv- 

 ing the last two treatments yielded 97.82 per cent of clean rooted plants. 

 Apterite and vaporite were tried in place of the gas lime, but without results. 

 A further trial showed that a surface dressing of quicklime gave better results 

 than one of iron sulphate. 



Control of black canker of potato, Spieckermann {Illus. Landw. Ztg., 34 

 {1914), Nos. 2, pp. 7-9, figs. 3; 3, p. 16, fig. 1). — In experiments with fungicides 

 against Chrysophlyctis endohiotica the best results are claimed from sulphur 

 in soil applications. There was no seriously injurious effect on the growth of 

 the plant. 



Phloem necrosis as cause or symptom of leaf roll, R. Schandee and M. 

 TiESENHAUSEN {Mitt. Kahcr WUhcJms Inst. Lcmdw. Bromherg, 6 {1914), No. .'?, 

 pp. 115-124, figs. 4)- — Referring to views expressed by Quanjer (E. S. R., 29, p. 

 347), the authors state that their recent investigations, here discussed, only in 

 part confirm the conclusions of that author. They do not regard phloem 

 necrosis as the cause of leaf roll of potato, but as a secondary phenomenon 

 probably due to some functional disturbance not yet fully understood. 



Wart disease of potatoes {Gard. Chron., 3. ser., 55 {1914), No. 14I6, pp. 106, 

 107). — The text is given of the order of the British Board of Agriculture and 

 Fisheries known as the wart disease of potatoes (infected areas) order of 1914. 

 It relates to i>rotection against potato canker, due to Sijnchytriuni endobiotir 

 cum, giving definitions, regulations, penalties, etc., with a list of resistant 

 varieties recommended for planting on premises already infected with the 

 disease. 



Powdery scab (Spongospora subterranea) of potatoes, I. E. Melhus ( U. S. 

 Dept. Agr. Bui. 82 {1914), PP- 16, pis. 3). — This is a description of the powdery 

 scab of potatoes, which is well known in Europe, particularly in the British 

 Isles, and which has lately been found present in parts of the LTnited States 

 (E. S. R., 29, pp. 448, 550). A bibliography is appended. 



The potato quarantine and the American potato industry, W. A. Orton 

 (17. S. Dept. Agr. Bui. 81 {1914), PP- 20, fig. i).— After describing a number of 

 the more destructive diseases of the potato the author gives the text of orders 

 relating to the regulation of the importation of potatoes and the potato quar- 

 antine order. By the latter order the stoppage of potato importations from 

 Canada and all countries of Europe for an indefinite period has been brought 

 about largely on account of the occurrence of the powdery scab {Spongospora 

 subterranea). Under certain regulations potatoes will be allowed to enter this 

 country from nonquarantined countries when properly inspected and certified 

 to by officials in the country of origin. 



A discussion is given of the potato crop of the United States and of the de- 

 sirability for utilization of surplus potatoes. 



The black rust of Deli tobacco, J. A. Honing {Bui. Deli Proefstat. Medan, 

 No. 1 {1914), pp. 16, pis. 2). — This disease, which is called by planters black 



