150 EXPEEIMENT STATION RECOED. [Vol. 35 



already noted (E. S. R., 34, p. 243) regarding the appearance of Sclerospora 

 viacrospora on cereals in France. 



Club root, A. H. Cockayne (Jow. Agr. [New Zeal], 11 (1915), No. 3, pp. 

 197-203, figs. 3).— Club root is said to attack a number of cultivated crucifers 

 and several weeds of the same family in New Zealand, where it is widely 

 disseminated, being found in all classes of soils. It is thought that its appear- 

 ance in calcareous soils may be due to the leaching of the lime from the upper 

 layers in such localities, as acid soil conditions are much more favorable than 

 alkaline to its development. The excrescences, due to a slime mold {Plasmodi- 

 ophora brassicw), are distinguished from swellings somewhat similar externally 

 but caused by nematodes or else by hybridization. The organism is commonly 

 distributed by the feet of stock. 



Leguminous crops offer a ready means of rotation, which should be employed 

 in connection with liming. Artificial fertilizers appear to increase the develop- 

 ment of club root. The use of basic manures is advised. Basic slag has given 

 good results in parts of the North Island. Certain varieties of swedes appear 

 to be relatively resistant. 



The potato blight in India, J. F. Dastub (Mem. Dept. Agr. India, Bot. Ser., 

 1 {1915), No. 3, pp. IJf, pi. 1). — It is stated that late blight or leaf curl (PJty- 

 tophthora infestans) of potato, which is prevalent in the hills in India, first 

 made its appearance in the plains in 1899-1900. It disappeared after three or 

 four years, but reappeared in a violent outbreak in 1912-13 at Bhagalpur and 

 Rangpur, attacking also the tomato crop at the latter place. This latter appear- 

 ance is ascribed to the use of seed tubers from Darjeeling and Naini Tal, where 

 the disease seems to be present each year. Experiments and observations since 

 carried out appear to show that the summer heat of the plains is suflicient to 

 kill the parasite. It is accordingly recommended that seed procured from in- 

 fected localities be obtained early enough to allow them to pass some part of the 

 summer on the plains. 



The gross and minute alterations in the plant due to the attack and progress 

 of the parasite are described, more particularly the developmental phases of the 

 haustoria and the influence of the fungus in producing deformation of the 

 starch granules. Certain bodies regarded as resting conidia, produced in pure 

 cultures on artificial media, are also discussed. 



Late blight of potato, R. A. Jehle [Estac. Expt. Agron. Cuba Circ. 48 {1915), 

 pp. 3-6, pis. ^).— This contains a brief discussion of the late blight of potato, 

 due to Pliytophthora infestans, which is is said to cause in Cuba the loss of a 

 large part of the crop each year. Experiments there are said to have confirmed 

 those made elsewhere as to the beneficial effects of a 5 : 5 : 50 Bordeaux mixture. 

 The applications should begin when the plants are a few inches high and 

 should be repeated at intervals of eight or ten days to suit the weather, at the 

 rate of from 50 to 75 gal. per acre according to the size of the plants. 



Treatment for late blight of potato, E. Foex {Jour. Agr. Prat., n. ser., 28 

 {1915), No. JfO, pp. 438-Jf40). — This discussion relates mainly to the experimen- 

 tation reported by Pethy bridge (E. S. R., 32, p. 239) in so far as that deals 

 with the superiority of the Burgundy as compared with the Bordeaux mixture 

 for Phytophthora infestans, or late blight of potatoes. 



Wart disease of potatoes {Gard. Chron., 3. ser., 58 (1915), No. 1506, p. 294).— 

 A list is given of varieties of potatoes said to have been recommended by the 

 Board of Agriculture and Fisheries for planting In 1916 on areas infected 

 with wart disease in England and Wales. 



The sugar beet nematode and its control, H. B. Suaw (Sugar [Chicago], 

 n (191.5), Nos. 2. pp. 31-35, figs. 6; 3, pp. 56-60, fig. 1; 4, pp. 58-61; 5, pp. 58-63, 

 figs. 8; 6, pp. 58-6^, fig. 1; 7, pp. 55-58; 8, pp. 51-53; 9, pp. 54, 55).— The author 



