DISEASES OF PLANTS. 253 



The wintering and combating of the oak mildew, F. W. Neger (Tharand. 

 Forstl. Juhrh., 62 {1911), No. 1, pp. 1-9, flgs. 3). — Investigations are reported 

 which indicate that the conidia of the oak mildew do not withstand the winter, 

 but that tiie fungus is carrie<l over by means of mycelium in the buds. For 

 the control of the mildew in nurseries and elsewhere 1 or 2 sprayings with 

 liiiie-siilphur are recommended, the number of applications to be determine<l 

 by the virulence of the attack. 



Preliminary notes on three rots of Juniper, G. G. Hedgcock and W. H. Long 

 (Mycologia, 4 (1912), No. 3, pp. 109-111,, pis. 2; abs. in Phytopathology, 2 

 (1912), No. 1, p. 48). — The authors give descriptions of the gross and micro- 

 chemical characters of 3 heart rots of junipers, also the distribution and damage 

 done by each, and technical descriptions of the sporophores. The rots dis- 

 cussed are the white rot of Jiiniperus virginiana, due to Fames juniperinus; 

 yellow rot of /. monospcrnm, J. ntahethsis, and J. sabinoides, caused by F. earlei; 

 and the stringy brown rot of J. sabinoides, J. monosperma, and J. utahensis, 

 caused by F. teranus. 



The nature of witches' brooms on Pinus sylvestris, F. Zach and K. von 

 TuBEUF (Naturw. Ztschr. Forst u. Landw., 10 (1912), No. 1, pp. 61-64, fld- 1) — 

 A discussion is given on the nature and causes of witches' brooms occurring on 

 the above and other species of pine. 



The blister rust of white pine, A. D. Selby (Ohio Nat., 11 (1911), No. .'/, 

 pp. 285, 286; abs. in Centbl. Bakt. [etc.^, 2. Abt., 32 (1912), No. 6-12, p. 333).— 

 This disease, known to have been found recently in two or three places in the 

 United States, is thought by the author to have come from Germany with 

 seedlings bought there. The blister rust has long been notable in that country 

 on account of its preference for American white pine. The fungus (Pcrider- 

 miiini strobi) is stated to be one stage of the rust of currants and gooseberries 

 ( Cronartinm ribicola ) . 



A disease of eucalyptus, R. Averna-Sacca (Bol. Agr. [Sao Paulo], 12. ser., 

 1911, No. 7, pp. 47-'f-4S2, fig. 1). — The author describes a disease of eucalyptus 

 due to some species of Erysiphacese, and gives briefly the results of experiments 

 for its control. The disease is most prevalent upon seedlings in the nursery, 

 and spraying with potassium sulphate solution or the use of sulphur is recom- 

 mended. In case of the presence of another disease, which is thought to be 

 due to Peronospora, the addition of 3 per cent powdered copper sulphate to the 

 sulphur is advised. 



A new paint-destroying fungus, G. Massee (Roy. Bot. Gard. Kexo, Bui. Misc. 

 Inform., 1911, No. 8, pp. 325, 326, pi. 1). — The author describes a fungus that 

 flourishes in great profusion on fresh paint in hothouses, its development being 

 favored by a high temperature and constant humidity. It has also been ob- 

 served occurring on paint elsewhere. 



About a month or two after a hothouse has been painted, numerous small 

 pale rose-colored specks appear. These increase in size and change to a purple 

 or sometimes dark red color. Where white paint has been used the coloring is 

 very conspicuous. When the fungus appears in abundance the paint is ruined, 

 in one instance a loss of more than $1,000 in a number of greenhouses being 

 reported. 



The presence of 2 per cent carbolic acid in paint was found to arrest the 

 development of the fungus, and hydrogen peroxid would bleach or considerably 

 reduce the red color without injuring the paint. 



The fungus, which is believed to be undescribed, Is named Phoma pigmenti- 

 vora n. sp., and a technical description is given. 



Experiments with lime sulphur against some fungus diseases, L. Sava- 

 STANO (R. Staz. Sper. Agrum. e Frutticol. Aoireale, Bol. 5, 1912, pp. 6). — Ex- 



