674 EXPERIMENT STATION RECORD. 



This disease was first observed at Ganges in 1885 and quickly spread throughout 

 other portions of France. For combating the disease the thorough use of Bordeaux 

 mixture is advised, the applications to be made with reference to the periods of fun- 

 gus invasion. 



Invasions of black rot in 1904, J. Capus (Rev. Vit., 23 (1905), Nos. 594, pp. 

 485-489; 595, pp. 523-528; 596, pp. 549-552; 597, pp. 574-577, fig. 1).— The results of 

 the author's observations on the appearance and periodicity of black rot in 1904 are 

 given. The relation between the appearance of the fungus and the atmospheric con- 

 ditions are discussed at considerable length. 



The treatment of black rot, A. Prunet (Rev. Vit, 23 (1905), No. 593, pp. 

 461-464). — The author recognizes 2 forms of black rot invasion. The first is caused 

 by the development of the fungus from the spores carried over during the winter, 

 and the second, which appears later, develops from the spores produced during the 

 primary invasion. 



For the reduction of the first invasion, all fruits which remain on the vines should 

 be destroyed, as well as the foliage on the ground, and for the later attacks the use of 

 fungicides is recommended. The first application should be made when the plants 

 have attained 2 or 3 small leaves, and this should be followed at intervals of from 8 

 to 10 days during the season. Fungicides containing 3, 4, and 5 per cent copper sul- 

 phate have been tested, and it was found that a 2 per cent solution is to be preferred 

 in combating the black rot, 



Combined treatment for the prevention of diseases of the grape, E. Zach- 

 arewicz (Rev. Vit., 23 (1905), No. 593, pp. 476-478).— For the prevention of downy 

 and powdery mildew and white rot the author recommends an early application of 

 a fungicide composed of copper sulphate 1 kg., powdered soap 1 kg., and water 100 

 liters. * 



If the season is exceptionally rainy the addition of J kg. each of the copper sul- 

 phate and soap is recommended. For the later applications the author recommends 

 powdering the vines with crude plaster 70 kg., powdered soap 5 kg., and sulpho- 

 steatite 25 kg. A second treatment with the liquid fungicide just before flowering 

 is recommended, to be followed later by an application of triturated sulphur 80 kg. 

 and sulphosteatite 20 kg. 



A new rose disease in Austria, G. Kock (Ztschr. Landiv. Versuchsw. Oesterr., 8 

 (1905), No. 7, pp. 660-666, fig. l). — Notes are given on a newly recognized disease of 

 roses. It is said to be caused by Coniothyrium wernsdorffise, a recently described fun- 

 gus that attacks the rose canes, causing serious losses. An outline of experiments 

 conducted for its repression is given, in which the canes were treated with a copper 

 lysol mixture, Bordeaux mixture, and a trade solution known as Kerrow. No 

 results are reported. 



Sulphur fungicides, J. M. Guillon (Rev. Vit, 23 (1905), No. 590, pp. 378-383).— 

 The author describes the preparation of fungicides composed of Bordeaux mixture 

 and different forms of sulphur. 



He says that when freshly mixed these fungicides should have a greenish color, 

 which as the mixture stands, becomes gray and later black. The advantage of the 

 use of such a mixture is that it permits of the simultaneous treatment of grapevines 

 for protection against both powdery and downy mildew. The principal disadvan- 

 tage is due to the fact that the sulphur does not dissolve but is held in supension in 

 the mixture, and this requires constant stirring. 



The settling of the sulphur from the mixture may be retarded somewhat by the 

 formation of a gelatinous oxid or carbonate of copper, but not wholly checked. 

 When the freshly prepared combined Bordeaux mixture and sulphur is properly 

 applied in good season, its action is said to be superior to that of the ordinary Bor- 

 deaux, supplemented by the use of dry sulphur. 



The adherence of copper fungicides, J. M. Guillon and G. Guirand (Rev. Vit., 

 28 (1905), No. 699> pp. 628-631). — In continuation of the authors' previous experi- 



