754 EXPERIMENT STATION RECOED. 



The results of the experiments are described at consideral)le length, and the 

 author recommends for practical purposes a Bordeaux mixture containing 0.5 

 per cent copper sulphate with enough lime to neutralize the solution. 



The relation between the gray rot of grapes and the quality of wines, 

 G. GouiRANU {Rev. Vit., 28 {1901), No. 729, pp. 621-62J,).— The author states 

 that Botrytis cinerea on the grape is commonly accompanied or followed by a 

 number of fungi, each of which produces a chai'acteristic effect upon the fruit. 

 In pressing grapes where the gray rot has been prevalent, care should be exer- 

 cised to separate those attacked by the different fujagi, as these cause a pro- 

 nounced flavor that results in a marked inferiority of wine. 



The superiority of hybrids in resistance to the gray rot of grapes, A. 

 Berget {Rev. Tit., 28 {1901), No. 121, pp. 516-518). — Attention is called to the 

 resistance of certain grape hybrids toward gray rot, the observations being 

 made during the season of 1907, in which the disease was particularly abun- 

 dant. Of the more resistant forms, most of them were found to be hybrids in 

 which American varieties quite largely entered. 



The principal species of fung'i attacking construction timber, L. Grandeau 

 {Joitr. Agr. Prat., ii. set:, IJ, {1901), No. 36, pp. 291, 298).— A description is 

 given of the dry rot of construction timber due to McruUus lacrymans, which is 

 said to be by far the most destructive of fungi on this class of timber. In ad- 

 dition the injury caused by Porta vaporaria is described. 



New western species of Gymnosporangium and Roestelia, F. D. Kern {Bui. 

 Torrey Bot. Club, 3.'i {1901), No. 9, pp. Jf59-Ji63). — Technical descriptions are 

 given of 8 new species of Gymnosporangium occurring on junipers in Colorado 

 and adjacent regions, and also of 3 species of Roestelia found on species of 

 Cratjegus and Amelanchier. 



The red disease of firs in the Jura region, E. Henry {Rev. Eaux et Forets, 

 J,6 {1901), Nos. 22, pp. 613-682; 23, pp. 105-110).— Thi^ is a detailed paper, the 

 substance of w^hieh has already been notetl (E. S. R., 10, p. 657). 



Insect agencies as a cause of larch canker, J. Scott {Jour. Bd. Agr. [Lon- 

 don], l.'i {1901), No. 9, pp. 551-55-), p'gs. .'/). — The author calls attention to the 

 role of certain insects in spreading the larch canker fungus, particularly the 

 fungus fairy fly {Cweilius flariduH). 



Influence of Chermes on larch canker, E. R. Burdon {Gard. Chron., 3. ser., 

 .'{2 {1901), No. 1091, pp. 353-355, figs. 6). — A discussion is given of the relation- 

 ship between the larch canker caused by Dasyseypha ealyeina and certain 

 species of Chermes. The fungus is believed to be a wound parasite, and the con- 

 ditions offered by the insect seem peculiarly adapted to its development. 



Spraying young trees late in winter or early, in spring with kerosene emulsion 

 was found to be quite destructive of the insect and did not injure the trees. 

 Consequently the lial)i]ity to fungus infection was greatly lessened. 



A remedy for the spruce g'all and larch blight diseases caused by Chermes, 

 E. R. Burdon {Jour. Econ. Biol., 2 {1901), No. 2, pp. .5.}-67). — An account is 

 given of the relation between the Chermes and the larch canker due to Pcziza 

 ivUlkommii and the spruce gall caused by Scptoria parasitica. 



The author has carried on some experiments that seem to indicate the practi- 

 cability of combating these diseases by the use of kerosene emulsion thoroughly 

 applied to the trees during the winter season. When sprayed over young trees 

 in January, examinations made several months later failed to show any live 

 insects and there was a conspicuous reduction in the amount of disease. 



Almost as good results were given in another series of experiments in which 

 the solution used was simply a strong soft soap solution, made by dissolving 1 

 lb. of soap to 1 gal. of water. 



