DISEASES OF PLANTS. 905 



siilpliiir not only did not liavo any elVect u\)ou tlic <;oiininafi(.n of the 

 spores, ))iitAvhen n.sed in combination of copper, it iVefpiently destroyed 

 the ellieiency of the copper salts. 



Report on practical work of the professor of biology, J. IT. 

 t'ANTOX {Ontario A(/l. Colhuc (ind E.vptl. F<tnn h'pl. Jsur,^ pp- ''^'-^- 

 pit. .,?).— A spray calendar is ojven for the insect and fungns enemies 

 of the more important frnits and vegetables with formnlas for the |)rep- 

 aratiou and directions for the application of the insecticides and fnngi- 

 cides recommended. 



A rei)ort is given of comparative tests of fungicides for the prevention 

 of raspberry anthracnose and the leaf si)ot of currant and gooseberry, 

 Bordeaux mixture, a solution of coi)per sulphate, and a solution of cop- 

 per carbonate being used in four applications. The diseases in vcrv 

 few cases were observed on the foliage of the sprayed plants, while 

 those uusprayed were attacked to a greater or less extent. 



Botrytis douglasii as an enemy to pine tree culture, J. Kit/.ema Bos (Forstl. 

 natnnr. /.Ischr.. C, {1S07), Xo. 4, pp. 174-lSo, Jitj. 1). 



Bacteriosis of the hemp, \. Peglion {'AlaJpUjhia, lo {1S!>G), pp. .',50-560; abs. in 

 Jour. lioy. Micros. Soc, 1897, IT, p. 157).— k. bacterial disease of the Rtein of hemp is 

 described. The organisiu closely resembles Bacillns cubonianits and may prove iden- 

 tical Avith it. 



The bacteriosis of mulberry, V. Pegliox {Cenihl. Ball, iind Par. Alhj.,3 {1S97), 

 Xo. l,pp. 10-13). — Notes are given ou the life history of Bacterium uiori. 



A parasitic agaric, N. C. ('coke (Oard. Chron., ser. 3, 21 {1897), Xo. 540, p. 284). — 

 Notts are ojiven of Ihjpholoma fascicularc found parasitic on the roots of raspberry 

 canes in Australia. 



On the polymorphism of Sporotrichum, E. Boui.ANGEii {Rev. Mijcoh, 19 {1897), 

 Xo. 74, pp. 37-45, pis. 4). 



Concerning the causes of potato rots, FitANK {Ceuthl. Bald, und Par. JIhj., 3 

 {1897), Xo. l,pp. 13-17). 



Potato blights and fungicides, L. K. Jones ( Vermont Sia. Rpt., 18'i5,pp. 35, 36). — 

 An abstract of Bulletin 4it of the station (E. S. K., 8, i)p. 138, 139). 



Observationson the Rhizoctinia of the potato, E. Ro7.\:{('ompt. Rend., 123{1896), 

 Xo.23,pi). 1017-1019). — The disease of jjotatoes caused by Rhizoctiuia solaui is some- 

 times associated with the potato scab caused by OiJspora scabies, but is seldom found 

 on the early varieties, being almost entirely confined to the latter classes. It lias 

 been known since 1842, but is <onsidered of little real importance, the fungns living 

 upon the tuber and causing little loss. Late harvested potatoes are sometimes fonn<l 

 whose surfaces are dotted with the numerous sclerotia of the fungus. Such tubers 

 should not be planted, since the disease through them would be spread to the suc- 

 ceeding crop. 



Forms of the black rot fungus. A, Pkinet {Compl. Rend., 124 {1897), Xo. 5, pp. 

 250-252).— Tin- author has iuvestigated the spring forms of the black rot fungus and ^ 

 finds it is carried tlirough the winter by masses of sclerotia whicb, upon the return 

 of the growing season, develop what he terms "invasion spores" through which tbo 

 disease, is spread. The perithecia and pycuidia are produced in no relative order or 

 I)roportion. 



Ripe rot of grapes, J. Dufouk {Chron. Agr. Cant. Vaud, 9 {1896), Xos. 2S,pp. HOS- 

 609; 23, pp. iJ27-';32 ; and 10 {1897), Xos. 2, pp. 27-33; 3, pp. .■75-o-.9).—N<i«es are given 

 on Jlotriitis cinerea with suggestions for its pnjvention. 



On the treatment of stock in vineyards attacked by oidium in 1896, .F, 

 Dii-oUR {Chron. A;/r. Cant, laud, 10 {1897), Xo. 4, pp. 1(>7-1 10).— Tha author recom- 

 mends the use of iron sulphate in various forms upon vines that had been attacked 



