431 



Chimikus (G. N). Othgt fleflTenbHOCTM SHToiviojiorMMecKoro 

 riepcoHajia CenbCKO - XoaflMCTeeHHoro floAOTflejia TawOoBCKoro 

 fySaewiOTCOBXOSa B 1920 r. [Report on the Activities of the 

 Entomological Staff of the Agricultural Sub-department of Tambov 



in i920.]-^Tpyflbi 2ro BcepoccMMCKoro SHTOMO-OmonaTOJiorMMec- 

 Koro CtesAa b rieiporpaAe, 25-30 OKiflgpn 1920 rofla [pyoc.2nd 

 All-RussiiDi Entomo-Phytopath. Meeting in Petrograd, 25ih-30th 

 October 1920], Petersburg, 1921, pp. 48-52. [Received 21st June 

 1922.] 



The work of the entomological staff in the Tambov district has been 

 carried on under great difficulties, chiefiy owing to the insufficient 

 number of workers and the lack of materials ; for this reason the 

 actual application of remedial measures was also very limited, and 

 demonstrations were restricted to the immediate environment of the 

 town. Brief notes are given on some of the common insect pests 

 occurring in 1919 and 1920, with an outline of the work as planned 

 for 1921. 



Lebedev (F. N.). floKnaA HananbHHKa PaaoBOM SKcneAimuM Hapo- 

 AHoro KoMMcapJiaTa SeMneAennji o npuweHeHUM yAymnMBbix 

 cpeACTB B Aene c BpeAmejiflMM cejibCKoro xoaniicTBa. [Report of 



the Director of the Gas Expedition of the National Com- 

 missariat of Agriculture on the /\pplication of Asphyxiating 

 Siibstances in connection udth the Control of Agricultural Pests.] — 



TpyAbi 2ro BcepoccMMCKoro 3HTOMo-OMTonaTOJiorMHecKoro CijesAa 

 B nerporpaAe, 25-30 OKTflOpn 1920 roAa [Proc. 2nd All^ Russian 

 Entomo-Phvtopath. Meeting in Petrograd, 25th-30th October 1920], 

 Petersburg,' 1921, pp. 70-73. [Received 21st June 1922.] 



As a result of experiments carried out in 1917 the author considered 

 asphyxiating gases to be superior to the substances generally used 

 for the destruction of agricultural pests such as locusts. Subsequent 

 observations, although carried out under very trying circumstances, 

 have confirmed this opinion. A brief account of this work carried out 

 in 1918, 1919 and 1920 is given. The lethal dose of chlorine for locusts 

 was found to be not less than 0-1 volume per cent. Even a dose of 

 1-55 per cent, does not affect the germination of grain, though it 

 slightly retards growth. 



SoLDAu (P. la). ripMMeHeHMe yAyiUHMBbix raaoB i\nn yHMHTOweHMe 

 BpeAMTeneM cenbCKoro xosnwcTBa (cycjinKOB m capaHHw). [The 



Apphcation of Asphyxiating Gases for the Destruction of 

 Agricultural Pests (Ground Squirrels and Locusts).] — TpyAbi 



2ro BcepoccMMCKoro SHTOMO-OMTonaTOJiornnecKoro CT>e3Aa b 

 neiporpaAe, 25-30 OKIflSpn 1920 rOAa [Proc. 2nd All-Russian 

 Entomo-Phytopath. Meeting in Petrograd, 25th-30th October 1920], 

 Petersburg, 1921, pp. 74-87. [Received 21st June 1922.] 



Details are given of the technique employed and the prevailing 

 weather conditions in the experiments dealt with in the preceding 

 paper. These experiments could not be carried out under natural 

 conditions and were limited to the liberation of chlorine gas over masses 

 of locusts placed at varying distances away. 



