DISEASES OF PLANTS. 865 



recommends spraying the beds with a solution of copper sulphate, 3 kg. to 100 liters 

 of water. 



On the relation of two species of Puccinia on Stachys, P. MAGNUS (Her. Dent. 

 Boi. Gesell., 16 (1898), Xo. 10, pp. 877-885, pi. 1).— Notes are given on Puccinia har- 

 ioii and /'. vossii. 



Diseases of carnations, P. Soraueu (Ztschr. Pflanzenkrank., 8 (1898), Xo. 5, pp. 

 283-295).— The author describes at some length 9 diseases of carnations that have 

 been observed in Germany. 



Root rot of alfalfa and sugar beete, V. Pegmon (Hot. Ent. Agri. e. Patol., 4 

 (1S97), pp. 367-369; aba. in Ztschr. Pflanzenkrank., 8 (1898), X<>. 5, p. sdp).—Briel 

 notes are given on the attacks of Rhizoctonia violacea on the alfalfa roots and Dema- 

 topliora necatrix on the beet roots. 



The bacterial wet rot of potatoes, C. Wehmer (Centbl. Bakt. u. Par. 2. Alt. 4 

 (189S), No. 13, pp. 540-546; 14, pp. 570-577; 15-16, pp. 627-635; 17-18, pp. 694-700; 'l9, 

 pp. 754-739; 20, pp. 764-770; 21, pp. 795-S05, ph. 2). 



Combating potato diseases with Bordeaux mixture, E. Git/kit (Fiihling's 

 Landw. Ztg., 4S (1899), Xo. 4, pp. 142-148).— Three varieties of potatoes were thor- 

 oughly sprayed with Bordeaux mixture and the results of the treatment are given. 

 No Phytophthora appeared on the sprayed plants, and the yield of these plants as 

 compared with the checks was as 161 to 100. There were more large potatoes and 

 the specific weight and starch content were considerably higher, which was attrib- 

 uted to the fungicide. 



A root disease of mulberry trees, N. Ichakawa (Forstl.Xaturw. Ztschr., 7 (1S98), 

 Xo. 12, pp. 423-42S). — A disease of mulberry trees that has been known in Japan for 

 at least 17 years is described. It is said to be caused by HeJicobasidium sp. attacking 

 the roots of the trees. 



On the occurrence and prevention of grape diseases in Germany in 1896 

 (Abs. in Ztschr. Pflanzenkrank., 8 (1S98), Xo. 5, pp. 307-3 10) .—The diseases and inju- 

 ries are classed under those induced by climatic influences, those due to insects, 

 those caused by parasitic fungi, and those whoso origin is unkown. 



A bacteriological study of pear blight, Lillian Snyder (Proc. Amer. Assoc. 

 Adv. Sci., 47 (1S9S), pp. 426, 427). — The author has made a study of the life history of 

 the true pear-blight bacillus (Micrococcus amylororus), but the principal part of the 

 paper is taken up with the description of a second germ, which very frequently 

 accompanies it. This germ was isolated and carried through various cultures and 

 inoculation experiments made, and the author concludes that the second germ isolated 

 from the tree in connection with the true blight is really saprophytic. 



The leaves cf the Red Astrachan apple immune from the attack of Gymnospo- 

 rangium macropus, W.J. Bkal (Proc. Amer. Assoc. Adv. Sci., 47 (lS9S),p. 421). — The 

 author desiring to cultivate this fungus in the botanic gardens at the Michigan Agri- 

 cultural College secured young cedars well supplied with living galls and planted 

 them almost in contact with 2 young apple trees of the Red Astrachan variety. 

 Artificial transfers were made of the spores from the cedar to the apple and numer- 

 ous examinations made, but no traces of the fungus could be found on the apple 

 leaves. The test was repeated in 1898 with similar results, and a letter from L. R. 

 Jones, of the Vermont Experiment Station, is quoted, in which it is stated that he 

 had tried to induce the teleutospon s of red cedar to attack red astrachans with neg- 

 ative results. 



On the occurrence of a yeast form in the life cycle of the black rot cf apples, 

 W. B. Alwood (Proc. Amer. Assoc. Adv. Sci., 47 (1893), p. 422).— The author reports 

 the discovery of a yeast form in laboratory culture of the fungus causing the black 

 rot of apple (Sphceropbis malorum). This yeast form has been isolated and reinfections 

 made on the fruit of apple produced the fruiting bodies characteristic of the black- 

 rot fungus. 



