DISEASES OF PLANTS. 347 



ton anthracnose, a more extended account of which has been given elsewhere 

 (E. S. R., 22, i». G4S). 



Notes on bacterial blight in cotton, J. S. J. McCall (Nyasaland Agr. and 

 Forestry D<i)t. Bill. 2, J!)10, pi>. -i). — According to the author, the bacterial dis- 

 ease of cotton {Bacterium malvacearum) has proved one of the most destructive 

 diseases of Egyptian cotton in Nyasaland, some estates reporting losses amount- 

 ing to as much as 60 per cent. 



Tlie disease was first observed in 1909 on rattoon cotton and later was found 

 in a number of localities. Egyptian and Sea Island cottons seem to be partic- 

 ularly subject to the disease, but certain varieties of American Upland cotton 

 have developed a high degree of resistance. Nyasaland Upland cotton and a 

 hybrid cotton resulting fronl a cross between American and Egyptian varieties 

 have shown marked resistance. 



The location in which cotton is grown seems to have an effect upon the pres- 

 ence of the disease, and it is advised that Egyptian cotton should not be grown 

 on lowlands adjoining rivers. It is recommended that all cotton plants be 

 uprooted and burned immediately after picking and that the practice of rattoon- 

 ing, especially on river plantations, be avoided. Seed from diseased plantations 

 should be soaked for an hour in a solution of corrosive sublimate or formalin. 



Studies on the parasitic fungi of rice in Japan, J. Miyake (Bot. Mag. 

 [Tokyo], 23 {1909), Nos. 266, pp- 85-101; 267, pp. 127-154; abs. in Centhl. Bakt. 

 [etc.], 2. AU., 26 {1910), No. 16-17, pp. 1,76, .//77).— This gives a list of fungi 

 parasitic on rice in Japan, of which the following are described as new : 

 Melanonniia ylumaruni, MycosphccrcUa {Spltwrella) shiraiana, M. {S.) hondai, 

 Pharcidia oryza\ Pluvospliwria oryzw n. g. and n. sp., Leptosphwria iwamotoi, 

 Ophiobolus oryzw, Pleospora oryzw, Gnomonia oryzw, Phyllosticta japoniea, 

 P. iniurai, Chwtophoma glumarum, Coniothyriuni japonicum, C. hrcvisporum, 

 V. anomale, Sphwropsis japonicum, Sphwronema oryzw, Diplodia oryzw, Dfp- 

 lodicUa oryzw, Hcndcrsonia oryzw, Septoria longispora, S. curvula, Phwosep- 

 toria oryzw, Dinemasporium oryzw, Cladosporium oryzw, Cercospora oryzw, 

 Epicoccitm Iiyolojic>i, and Epldochiuin oryzw. 



The black scab of the potato, J. Ritzema Bos {Tijdschr. Plantenziekten, 

 16 {1910), No. 1-2, irp. .59-67, ) .—After calling attention to the gradual dissem- 

 ination of this disease {Chrysophlyctis endobiotica) throughout European coun- 

 tries, especially in England, and the great damage to the potato industry 

 wherever it has obtained a foothold, the author warns the potato growers of 

 the Netherlands to guard against its introduction by avoiding the use of for- 

 eign seed potatoes. Any suspicious cases should be examined by a comi)etent 

 inspector and if diseased with the black scab the entire lot should be used as 

 stock food. 



The prevention and control of the potato wart disease, H. Josting {Dciit. 

 Landto. Prcsse, 36 {1909), No. 88, p. 91,1, fig. 1). — For the control of this disease 

 the author recommends the use of healthy seed potatoes, crop rotation, collect- 

 ing and burning badly diseased tubers, and the feeding of slightly infected 

 jiotatoes to stock after the tv-bers have been cooked. 



Some of the more important contributions in 1909 on the diseases of 

 sugar beets and potatoes, A. Stift {Ccntbl. Bakt. [etc.]. 2. Abt., 26 {1910), 

 No. 18-19, pi>. 520-.')U0). — A critical review is given of some of the more impor- 

 tant contributions that appeared in 1909 relating to the insect pests and fungus 

 diseases of sugar beets and potatoes. The literature reviewed is almost all 

 from German sources. 



Diseases of sugar beets, O. Fallada {Osterr. Ungar. Ztschr. Zuckerindus. u. 

 Landw., 39 {1910), No. 1, pp. 42-1,8, figs. 2).— Brief notes are given on the dis- 

 eases observed on sugar beets in Austria-Hungary during 1909. Among those 



