648 EXPERIMENT STATION EECOED. 



1, pp. 53-55). — ^A further report (B. S. R., 23, p. 741) is made on infection ex- 

 periments in which certain varieties of barley showed marked immunity against 

 smut (UstUago hordei tecta). 



Wart disease of potatoes (Synchitrium endobioticum), G. T. Malthouse 

 (Harper-Adams Agr. Col. [Biil.J, 1910, ^'ov., pp. IfO, pis. 15). — This is an ex- 

 tended discussion of the wart disease of the potato as found in England, includ- 

 ing the life history of the disease, infection of host, time of infection, spread 

 of the disease, and conditions favoring its development. The results are given 

 in tabulated form of experiments conducted during 1909 and 1910 on resistant 

 varieties and fungicides. 



The disease was found to be fairly prevalent over the greater part of 

 England, but limited, however, in most instances to gardens and allotments. 

 The application of raw night soil tended to increase the severity of an attack. 

 In the variety and fungicide trials of 1909 and 1910 no fungicides of any value 

 for controlling the disease were found, but some 24 varieties of potatoes proved 

 to be immune, from which selections suitable for various classes of soils may 

 be made. Some of the immune varieties never produced a good crop unless they 

 were boxed and well sprouted before planting. The disease also developed on 

 apparently sound tubers in storage. The manure from hogs when fed the dis- 

 eased raw tubers proved capable of infecting healthy soil. 



A bacterial disease of potato and tomato, K. Bancroft (Agr. Bui. Siraits 

 and Fed. Malay States, 9(1910), No. 12, pp. 478-480).— The occurrence of this 

 disease (Bacillus solanacearuin) on tomatoes in one district of the Malay States 

 is reported. 



The leaf-splitting' disease of sugar cane (gele strep enziekte), G. Wil- 

 BRiNK and F. Ledeboer (Medcd. Proof stat. Java-Saikeriiidiis., 1910, No. 39, pp. 

 443-495, dgnis. 7). — The authors describe the characteristics of this disease, 

 and discuss its dissemination, probable causes, the damage done by it, and 

 methods for its control. 



The rejection of all diseased canes as seed, and the use of seed canes known 

 to be perfectly sound and of varieties resistant to the disease are advised. 



A bacterial disease of swedes, J. H. Priestley and A. E. Lechmere (Jour. 

 Agr. Sci., 3 (1910), No. 4, irp. 390-397).— The results are given of a study of a 

 soft rot of swedes. The disease is attribute<l to the action of an organism, 

 probably Bacillus oleracece, but so much resembles a disease produced by Pscudo- 

 monas destructans and is so closely allied to it in many of its cultural characters 

 that the two organisms may prove to be only different gi'owth foi'ms of the same 

 parasitic species. 



On the mosaic disease of tobacco, J. A. Lodewijks, Jr. (Rec. Trav. Bot. 

 N^erlund., 7 (1910), pp. 107-129; ahs. in Bot. Centbl., 114 (1910), No. 20, p. 

 518). — ^The results are reported of a series of experiments on the effect of light 

 intensity and of different colored lights on this disease. 



It was found that tobacco mosaic was neither checked nor cured by lowered 

 light intensity, and that neither diffused nor colored light had any marked effect 

 on the disease when the healthy leaves on the diseased plants were excluded 

 from direct sunlight. When, however, the upper and diseased parts of the 

 tobacco plant were covered, and the lower healthy leaves left exposed to the 

 sunlight, the following results were obtained : With diffused light a checking of 

 the disease occurred, with a red light the disease decreased, and with a blue 

 light a complete cure resulted. The author claims that this is due to the for- 

 mation of an antivirus in the healthy leaves of the plant which counteracts the 

 virus of the disease. 



Gooseberry mildew in Cambridg-eshire (Gard. Chron., 8. ser., 49 (1911), 

 No. 1255, pp. 24, 25). — Attention is called to the increased spread of this disease 



