50 EXPERIMENT STATION RECOED. 



Observations on the morphology of the Oidium of the oak, T. Ferraris 

 (Atin. MycoL, 7 {1909), No. 1, pp. 62-73).— Technical descriptions and com- 

 parisons of the various species of Oidium found on oalis are given, together 

 witli a general discussion of the dissemination and systematic position of the 

 Oidium so prevalent in 190S. 



The mildew of the oak, O. Kirchner (Allg. Forst. u. Jagd Ztg., So {1910), 

 May. pp. 158-161).— The author, after calling attention to previous outbrealis of 

 mildew on the oaks in Europe, discusses the characters, dissemination, taxo- 

 nomic position, and control of the oak mildew so prevalent in 1908 throughout 

 European countiMes. 



The prevalence of the oak mildew in 1908, K. von Tubetjf {Naturiv. Zt^rhr. 

 Forst 11. Lumlic, 7 {1909), No. 2, pp. 119-121 ; uU. in Bot. CentU., 110 {1909), 

 No. 21/, pp. 627, 628). — The author discusses the systematic position of the mil- 

 dew, and its general distribution and severity throughout Europe. Two species 

 of oaks {Quercus ruhra aud Q. palustris) were observed to be very resistant 

 to thin disease. A hot-water treatment was found of value in checking the 

 ravages of the fungus on the young trees, without serious injury to the foilage. 



The oak mildew in Austria-Hungary, G. Kock {Oaterr. Forst u. Jagd Ztg., 

 28 {1910), No. 3, pp. 18, 19). — It is stated that the oak mildew has appeared 

 from year to year in this region with varying degrees of severity. The injury is 

 caused by the interruption of assimilation and transpiration in the leaves which 

 are attacked by the fungus. In many cases it causes the death of seedling oaks 

 and young limbs, especially of Qucrcvs pcfliniciilata, Q. sessiliflora and Q. 

 cerris, while Q. ruttra is very resistant to the disease. 



Dusting the trees with powdered sulphur or spraying them with Bordeaux 

 mixture is recommended. 



The Oidium of the oak, .T. V. d'Almeida {Rev. Agron. [PortugaU, 6 (1908). 

 No. S, pp. .'/;2-.'/.5). — The author briefly discusses the character and dissemination 

 of this disease, which appeared in Portugal in the summer of 1908, and sug- 

 gests treatment with sulphur as a possible remedy. 



A new parasitic disease of Juncus, E. J. Schwartz {Ann. Bot. [London], 2^ 

 {1910), No. 93, pp. 236.). — A brief account is given of a root disease of varioiis 

 species of Juncus, due to a mycetozoan parasite which the author calls aSoto- 

 sphwra junci. The infection of the root takes place by the entry of an^moeba 

 into a root hair and thence into the cortex. A detailed account of investigation 

 into the life history of the organism is to be published later. 



Azalea pontica and its parasites in Austria-Hungary, M. Raciborski {Bui. 

 Intcrnat. Acad. /S'r-i. Cracovie, Ct. Sci. Math, ct Nat., 1909, No. 7, pp. 385-391. figa. 

 2). — After discussing the range, habitat, and associated plants of this azalea, 

 the author figures and describes a fungus {E.ro1)asidiiim disroidcum) which 

 forms large galls on the leaves. Associated with this appears to be anotlier 

 Exobasidium that does not produce galls, but forms large circulai*, whitish 

 areas. This fungus on further study may prove to be an undescribed species 

 of Exobasidium. 



A new Ramularia from South Tyrol, P. RIaonus {Ber. Dent. Bot. flcftclL, 

 27 (1909), No. //. /)/}. 21. ',-222, figs. 5).— After describing as new a leaf spot 

 disease of Polygala imlgaris under the name of Ramularia hcimcrtlana. the 

 author gives a list of host plants for 6 parasitic genera of the Mucedinaceae, 

 namely, Ovularia, Didymaria, Bostrichonema, Ramularia, Ramulaspera, and 

 Cercosporella. 



Copper fungicides, Duke of Bedford and S. IT. Pickering {Wol}U7-n E.rpt. 

 Fruit Farm. Rpt., 11 (1909). pp. V-\-191 : App. pp. 2/).— This is an extensive 

 report of studies on fungicides, especial attention being given to those the etti- 

 ciency of which depends upon copper compounds. 



