1(52 EXPERIMENT STATION RECORD. 



different fungi are described in detail and tlie effect produced upon the host plants is 

 shown. While originally reported from Brazil, these fungi are known from other 

 localities. 



On the use of potassium permanganate against oidium, B. Chaizit {Rev. Vit., 

 16 {1901), Xo. 416, p. 631). — An account is given of the successful use of a 2 per cent 

 solution of potassium permanganate in protecting 2 exceptionally susceptible varieties 

 of table grapes against attacks of oidium. The question of the probable presence of 

 the permaganate in wines made from grapes treated with this solution has been raised, 

 and the author shows that it is hardly probaljle that any of the fungicide will tind 

 its way into the wine. 



Anew factor in combating mildews, F. W. Neger {Ztschr. Pflanzenkrcwl-., 11 

 {1901), No. 4-5, pp. 201-212). — In combating the powdery mildews the author calls 

 attention to the necessity of ascertaining the form in which the fungus i)asses the 

 winter and mode of distribution of the spores, grouping the different powdery mil- 

 dews into two classes based upon this factor. 



liife history and means for detection of timber rot fungi and similar organ- 

 isms, Vx. Marpmann {Cciithl. Bakt. ■«.. lar., 2. Abl., 7 {1901), Xo. 22, pj). 775-7S2).— 

 Notes are given on Merulius Jacrymans, Polyporusspp., Trametes radiciperda, Agaricus 

 melleus, etc. 



A fungus disease of juniper, A. von Jaczewski {Ztschr. Pflanzenkrank., 11 

 {1901), No. 4-5, pp. 203-207, Jigs. 7). — A description is given of a disease of junipers 

 caused by Exosporiumjuniperinum. This fungus has been previously described under 

 the name Coryneum jimipermum. Subsequent to this description it was given the 

 name Exosporium deflectans, and as the fungus belongs to the latter genus the author 

 has made the transformation of the specific name to conform with tlu' recent laws of 

 botanical nomenclature. In addition to this fungus, the author reports the occur- 

 rence of another {Tfendersonia notha) as sometimes occurring, as well as a second 

 species ( If. foliirola) . 



Studies on -fficidium elatinum, E. Fischer {Ztschr. Pflanzenkrank., 11 {1901), 

 No. 6, pp. 321-34S, flgs. 4).- — This fungus, which is said to cause the hexenbesens on 

 silver fir, has been studied by the author and its uredo and teleutospore forms 

 determined. The uredo and teleuto forms are reported as having been found upon 

 various species of Cerastium and Stellaria. The inoculation experiments are reported 

 on a large number of species of plants representing widely varying orders of plants. 

 Experiments are also reported on the production of hexenbesens from material 

 obtained from species of Stellaria, etc. 



The poplar rust, J. Fletcher {Canada Expt. Farms Rpts. 1901, pp. 259-261). — 

 The poplar trees of the Northwest Territories {Populus tremuloides) are reported as 

 badly affected by the fungus Melampsora popidina, and as a result of the attacks the 

 trees are frequently defoliated. A similar fungus is reported on the birch foliage. 

 Most of the young seedlings planted in this region are imported from Minnesota and 

 Dakota, and it is noted that those varieties of poplar which have been imported from 

 Russia have so far escaped the attacks of the fungus. If they should continue to 

 show this imnnmity their importance for tree planting in the West would be greatly 

 increased. 



Maple seed bligbt, J. Fletcher {Canada Expt. Farms Rpts. 1901, p. 259). — 

 During the summer of 1901, at Indian Head and the surrounding district, the see<l 

 of the ash-leaved maple {Negundo aceroides) were found seriously attacked by a 

 fungus which proved to be a species of Fusarium. When trees are affected by this 

 disease the seed show the injury, the edges of the wing becoming bleached and 

 spotted, and the seeds fail to fill. The importance of the ash-leaved maple as a 

 shade tree in the West can scarcely be overestimated, and should this disease persist 

 it would be necessary to grow seedlings from seed obtained from localities which are 

 not infested. 



