980 EXPERIMENT STATION RECORD. 



account of the possibilities of it proving to be destructive he calls attention tf) it and 

 suggests that all seed tubers should lie carefully examined before planting and those 

 whicli are diseased be burned or deeply buried. 



The potato disease, E. A. Nobbs [Agr. Jour. Cape (load Hope, 22 {1903), No. 1, 

 pp. 25-29, pU. 2). — A description is given of the potato rot due to Pliytoplithora infe.^- 

 tans, and the protection of the plants by the repeated and thorough spraying with 

 Bordeaux mixture is recommended as a preventive treatment. In addition to P. 

 infeMcms the author states that Hporidesmhnn e.dtioswn has been recently noticed as 

 causing consideral^le injury to potatoes, and suggests that possibly other fungi 'may 

 be found upon more critical examination. 



A, nematode disease of rice, J. van Breda de Haan {Meded. 'S Lands Plantentuin, 

 1902, No. 53, pp. 65). — This disease, which is very destructive in some parts of Java, 

 causing the loss of from one-third to nearly the entire rice croj), is due to a hitherto 

 undescribed nematode belonging to the genus Tylenchus, called by the author T. oryzie. 

 The disease is characterized by a reddening and dying of the leaves in longitudinal 

 strips. In dying, the leaves remain flat. The roots lose their white appearance, 

 become brownish and wrinkled, and finally decay. The author describes the nema- 

 tode and gives some account of its habits and life history. The adults live in the 

 soil while the larvse attack the roots. Tlie disease is carried from field to field by 

 the laborers, on tools, and by means of the irrigation water,' but is never transmitted 

 l)y means of seed. Methods of combating the trouble are suggested, among which 

 are greater care to prevent its spread, providing the young rice plants with the best 

 chance to form an abundance of good roots, and proper crop rotation in order to 

 destroy the organism in the soil. All varieties of rice are subject to the disease, though 

 some are less severely attacked than others. — h. m. pieters. 



Tobacco diseases in Galicia, M. Raciborski {Ahs. in Bat. C'entbl, 90 {1902), No. 

 15, p. .'/lU). — A rejiort of studies on the diseases to which tobacco is subject is given. 

 Among those mentioned are the diseases of roots which are said to be due to bacteria, 

 and diseases of the stem and leaves which are caused by the fungi Erifujphe commu- 

 nis, Sclerotinia sderotiorum, PhylloMicta. tahaci, Ascocliyta vicotiamr, and Capnopodium 

 salicinum. In addition to these diseases others are descrilied which are attributed to 

 atmosi)heric influences, and descrii)tions are also given of the mosaic disease of 

 tobacco as well as other somewhat similar affections. 



Erysiphe lamprocarpa on tobacco, G. E. Anastasia {E.rtr. from Bid. Tec. 

 Colli r. Tabacchi, Scafati ISalenio], 1 (1902), No. 1, pi. 1; ahs. in. Bot. Centbl., 90 

 {1902), No. 20, p. 556). — The author claims that the form of Erysiphe lamprocarpa 

 which occurs parasitically on tobacco is related to the conidial form {O'ld'mm tabaci) . 

 The difference in resistance of the different varieties of tobacco to this fungus is 

 pointed out. 



Apple fung-i, G. H. French, J. C. Written, J. C. Blair et al. ( Trans. Amer. Apple 

 Growers'' Cong. 1902, pp. 76-99). — Popular descriptive notes and discussions are given 

 of a number of the more common and destructive fungus diseases of the apple and 

 suggestions given for their prevention. The results of experiments for the control of 

 these diseases are given in some detail. 



A contribution to the knowrledge of Monilia diseases, K. ScHiLBERSKY(J/rfr/y/ar 

 Bot. LapoJc, Budapest, 1 {1902) , Nu. 5; abs. in Bot. Centbl., 90 {1902), No. 20, p. 565).— 

 The author claims that Monilia fruciigena and M. cinerea are specifically related, and 

 prefers their designation as ^^. frucfigena geuuina and M. fructigena cinerea. 



The rotting- and mummifying- of fruits, P. Passy {Per. Hort. [Pons], 75 {1903), 

 No. 2, p>p. 43-46, Jigs. 7). — An act-ount is given of the attack of Monilia fructigena on 

 apples, plums, etc., and suggestions given for its prevention. 



A disease of plums, J. Dufour {Chron. Agr. Canton Vaud, 15 {1902), No. 13, pp. 

 37 5-37 S, Jigs. 2) . — Descriptions are given of the effects produced by the fungi Exocu>- 



