848 EXPERIMENT STATION RECORD. [Vol.40 



Section by Fwiarwm spp. often resulting in death; and third, the mature 

 stage resulting in death, usually at an advanced stage of growth, often with 

 infection and decay of the new tubers. Infection is said to be of two kinds, 

 that from the soil to t^e roots and root hairs and that of the seed | 

 whereby the plant becomes diseased. 



For the control of the disease, the author suggests selection of disi 

 resistant varieties, proper cultural conditions for the potato plant whereby it 

 may maintain a degree of resistance through activity and health, lengthened 

 rotation, judicious irrigation practices, and the use of whole seed tubers free 

 from wound or injury. While these different methods have been Investigated 

 to some extent, they arte col yet known to be wholly effective in preventing loss. 



Vascular infection of the seed is not the first but is one of the conditions 

 assisting in bringing about decreased resistance to new infection from the soil. 



Internal rust spot disease of the potato tuber, S. G. Pai.nk {Ann. Apph Jiinl., 

 5 {191% I, No. 1, /'/'• 77-79). — Examination and inoculation studies by the author 

 of potatoes sent from two farms in the south of England have led to the con- 

 clusion thai the disease in question is very similar to one which has been 

 described under different names by several authors. The name internal rust 

 spot is suggested for the disease. Fuller discussion and description of this 

 disease are reserved for a later paper. 



The potato wart disease, a new and serious disease recently discovered in 

 Pennsylvania, C. R. Orton and F. 1 ». Kikn {Pemntylvania stu. Bui. I'd (1919), 

 pp. 8-16, figs. 4)- — A popular account is given of the discovery in Pennsylvania 

 of the potato wart disease due to Chrysoi>hhi< lis endobiotioo, and the life history 

 and development of the parasite causing the disease are described at consid- 

 erable length. At the time of the preparation of the publication, the disease 

 had been found it- 28 towns in three counties of eastern Pennsylvania. 



Black wart of potato, (',. FfiOH (Jftft. Apr. [France], Ann. Srrr. ttpiphftiea, h 

 (IH15), pp. J/5--i8, pi. 1). — This is a brief descriptive discussion of potato black 

 wart or black canker, due to ChrytophlycHa endobiotica, as existing in other 

 countries but DOl yet known to exist in France. 



A cane leaf spot, 1'. A. van pki; Bui (Union So. Africa Dcpt. Apr.. Soi Bui. 

 10 (1918), ]>n- 16, figs. 7). — An account is given of a disease noted by the author 

 in 1917 and marked by leaf spots which are described. The spores of the 

 fungus found in connection with the trouble, often in association with hspto- 

 sphwria sacchmi. show some resemblance to those of Hftl mlnthosportnm. The 

 symptoms resemble somewhat those due to Cercospora saccliari. The fungus is 

 aerobic. Viability of the spores is lost after about 49 days in dry places. At- 

 tempts to inoculate and reisolate the fungus wore successful. 



Root disease of sugar cane. J. A. STEVENSON (Rev. Apr. Puerto Rim, 1 (1918), 

 No. 6, pp. 869-879, figs. S). — Th • ..uthor discusses In connection with practical 

 prevention a disease or group of diseases of sugar cane roots in Potto Rico, 

 as occurring in association with Marasmius smihnri. U'nnantia stillifcra. and 

 Odontia aaccharicoUk 



An immune variety of sugar cane, C. O. Townsend (£<•»< nrc. n. n /'.. J° 

 (1919), No. 1272, pp. .$70- $72).— In connection with a study of the mottling 

 disease of sugar cane in Porto Rico (E. S. R., 39, p. 53), a Japanese variety of 

 sugar cane, obtained by the experiment station at Mayagues, P. EL, from Argen- 

 tina several years ago, has proved quite resistant. The variotv aeems to 

 ratoon strongly and to have considerable resistance to root disease, borer, and 

 stem rot. 



Angular leaf spot of tobacco, an undescribed bacterial disease. F. P>. 

 Fbommk and T. J. Mikkay (Jour. Ayr. Research [U. S.], 10 (1919), No. S, pp. 



