427 



BoRNER ( — ). Aufzucht der Reblausfliegen und ihrer Brut. [The 

 Breeding of Phylloxem Adults and their Progeny.] — Mitt. 

 Biol. Reichsanst. Land- u. Forstwirtsch., Berlin, no. 17, Jur.e 

 1919, pp. 23-24. [Received 1st July 1920.] 



The best method of collecting adult Phylloxera required for breeding 

 purposes is described. Some difficulty was experienced with regard 

 to the enclosure of the necessary vines, but a cover of finest parchment 

 paper proved satisfactory ; this cover was attached to the upper end 

 of a cardboard tube which surrounded the stem and the other end of 

 which was pressed into the earth. This had to be undertaken owing to 

 the death in the winter of 1916, through unavoidable neglect, of the 

 67th generation of a stock that the author had kept under observation 

 smce 1910. 



EscHERicH (K.). Das Forschungsinstitut zur Bekampfung tierischer 

 Schadlinge in Munchen. [The Munich Research Institute hn- 

 combating Animal Pests.] — Verh. Deutschen Ges. angew. Entom., 

 11. Mitgliederversammlung, Munich, 24-26 September 1918 ; Berlin, 

 1919, pp. 13-23. [Received 28th July 1920.] 



This new Research Institute will include departments for forest ar.d 

 agricultural pests ; later on a department dealing with enemies of man 

 and domestic animals will be added. Besides these main divisions 

 there will be a smaller section dealing with industrial and commercial 

 pests. There will be an independent division for chemistry and another 

 for bacteriological and mycological research. The central mstitute 

 will be supplemented by field stations established in foci of infestation. 

 Opportunity will thus be afforded for tramuig competent economic 

 entomologists, a matter that has hitherto been neglected in Germany. 



It is absolutely necessary that the results obtained by such an 

 institute should be available and applied universally throughout the 

 country. This pre-supposes a popular appreciation of economic 

 entomology, and the elementary schools must undertake this work. 



Stellwaag (F.). Die Verwendung von Blausaure zur Bekampfung 

 der Traubenwickler. [The Use of Hydrocyanic Acid Gas against 

 Vine Moths.] — Verh. Deutschen Ges. angew. Entom., II. Mitglieder- 

 versammlung, Munich, 24-26 September 1918 ; Berlin, 1919, 

 pp. 24-34. [Received 28th July 1920.] 



Tent fumigation with hydrocyanic acid gas in vineyards [R.A.E., A, 

 viii, 268] has been found to give such uncertain results as not to 

 warrant further work to develop this method. 



Treatment with solutions of hydrocyanic acid in water is however 

 very promising. Even with a weak solution of ^ per cent, the escaping 

 gas was able to kill the pupae. No other method has yielded a result 

 of 100 per cent., as was obtained at strengths varying from ^ to 3 

 per cent. The cost of spraying the stocks is smaller than that of any 

 other winter measure. Spraying with a solution of hydrocyanic acid 

 will probably prove useful also in orchards, in combating insects that 

 hibernate on the bark, and it should also be successful against those in 

 living or dead wood. Further experiments are being made in this 

 connection. 



