395 



responsibility for the conduct of the campaign and of investigations 

 as to the breeding places of the pests should be concentrated. The 

 Bureau should be financed bv pro-rata contributions from the local 

 funds of all the jjrovinces concerned, and should also receive grants 

 from the Central Government. The author was entrusted with 

 drawing up a full scheme for the organisation of such a Bureau to be 

 presented to the next Conference. 



TiMOFEiEv (S. N.). KynbTypanaMHaro Kycia m npoMSBoncTBO Man bi> 

 3anaflH0M"b SaKaeKaSbt. [The Cultivation and Production of 

 Tea in Eastern Transcaucasia.] — « PycCHJe Cy5Tponi1HM.» 



[Russian Subtropics], Batum, x, no. 1-2, 1917, pp. 1-32. 



The follo^ving local pests of the tea plant are mentioned : the tea 

 mite [Tetranyclms biocuhtus] ; a species of Lecanium, accompanied by 

 the fungus Meliola penzigi, Sacc. ; and caterpillars of a Tortricid 

 (probably Homona coffearia). These insects rarely cause great damage 

 and can be controlled by spraying with kerosene emulsion or with a 

 solution of soft soap and Bordeaux mixture. The mole-cricket 

 [Gryllotalpa gryUotalpa] also attacks young plants. 



Jatzentkovsky (E. v.). Mstj onbiTOB"b no 6opb6t C"b KpoBUHOM Tneti 

 BTs TepCKOH oonaCTM. [Experiments on the Control of Eriosoma 

 {Schizoneura) lanigerum, Hausm., in the Province of Terek.] — 

 « SeMJiefltnbMeCKafl ra3eTa.» [Agricultural Gazette], Petrogmd, 

 no. 42 .158), 28th October 1916, pp. 1101-1102. [Received 

 13th July 1917.] 



The environs of Vladikavkaz, in the pro^n^nce of Terek, are heavily 

 infested with Eriosoma {Schizoneura) lanigerum, and the author has 

 been experimenting with a view to discovering an effective and easily 

 made insecticide against this Aphid, i.e., one that would destroy the 

 waxy covering of the insect Avithout affecting the trees and be at the 

 same time inexpensive. The following insecticides were tried : — 

 kerosene in water of a strength from 5 to 30% ; 5-30% carbolineum 

 in water ; a mixture of both the above solutions at strengths of 5-10% ; 

 kerosene emulsion, containing 6 lb. kerosene and 1 lb. soft soap in 

 18-20 gallons of water ; carbolineum emulsion, containing 3 lb. 

 carbolineum and 4 lb. soap in 30 gallons of water ; soft soap (1 lb. in 

 3 gallons of water) ; tobacco extract (1 lb. in 3 gallons of w^ater) ; a 

 mixture of equal volumes of the last two ; carbol-tobacco emulsion 

 (5 lb. tobacco extract, 2 lb. hard grey soap, 2 lb. crude carbol, in 30 

 gallons of water) ; quassia emulsion (5 lb. c|uassia and 6 lb. grey soap 

 in 25 gallons of water) ; 1 per cent, lysol ; and 1 per cent, oxalic acid. 

 It appeared that oxalic acid, lysol and quassia are of no use ; better 

 results were obtained from soft soap, the eft'ect of which however 

 depended on the strength of impact of the spray, and from tobacco 

 extract and kerosene ; while quite good results were obtained from a 

 mixture of tobacco extract and soap. Repeated experiments with 

 these and other insecticides showed the following emulsions to be the 

 most effective : (a) 1% of carbolineum and 4-5% of soft soap in water, 

 which is regarded as the most useful ; {b) 3% of wood-alcohol, 3% of 

 turpentine, and 4-6% of soft soap in water ; (c) 2^/q of turpentine, 

 2% of xylol, 2% of wood-alcohol, and 4% of soft soap in water, which 



