430 



materials. There is urgent need of co-operation in the various districts, 

 and unless very drastic measures are undertaken, the destruction of 

 the whole of the 1921 crop is to be expected. 



Berejkov (R. p.). flea rofla npoTMBOcapaHHeBbix paSoT b Tomckom 



ry6epHI1l1. [Two Years of Anti-locust Work in the Government 



of Tomsk.]— Tpyflbi 2ro BcepoccMMCKoro SHTOMo-OiiTonaTOJio- 

 rMHecKoro C"be3fla b neiporpafle, 25-30 OKTflOpfi 1920 roAa 



[Proc. 2nd All-Russian Entonio-Phytopath. Meeting in Petrograd, 

 25th^S0lh October 1920], Petersburg, 1921, pp. 38-42. [Received 

 21st June 1922]. 



Locusts are the most important agricultural pests in the Tomsk 

 district, the species chiefly concerned being Gomphoccrits sibiricus, L., 

 and Stauroderus scalaris, Fisch. {Stenobothrus niorio, L.). The damage 

 caused reached its maximum in 1918, when over 351,000 acres of grain 

 crops were destroyed ; in 1919 and 1920 the injury reached 162,000 

 and 243,000 acres respectively. Extensive remedial measures were 

 planned, but had to be greatly reduced owing to the delay in obtaining 

 materials, etc. Although carried out on a smaller scale than first 

 intended, the results were very promising, and the consequent co-opera- 

 tion of the population was secured for 1920. The work in this year 

 had, however, again to be curtailed. Owing to the success obtained 

 with poisoned baits, the remedial measures have been entirely 

 restricted to this method, the low cost (especially when sawdust 

 and manure are used), easy application and the general independence 

 of weather conditions being some of the main points in its favour. 

 For the operations in 1921 it was estimated that over 32 tons of 

 sodium arsenite would be required. 



MegalOV (A. A.). KpaTKMM OtHBT fleflTejlbHOCTM CiaHLlMM SaiUMTbl 



PacTeHMM OT BpeflMTejieM CaparoBCKoro ry63eMOTAena. [Brief 



Report on the Activities of the Station for the Protection of 

 Plants from Pests in the Saratov District.] — TpVflbl 2rO BcepOC- 



cMMCHoro SHTOMO-dJMTonaTOJiorMHecKoro C"be3fla b neiporpaAe, 



25-30 OHTflgpn 1920 rOAa [Proc. 2nd All- Russian Entomo- 

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

 Petersburg, 1921, pp. 43-47. [Received 21st June 1922.] 



A brief outline is given of the work carried out by the Saratov 

 Station for the protection of plants from pests, chiefly during 1919. 

 Owing to the political conditions and the consequent difficulty in 

 obtaining supplies of poison materials, appliances, etc., the work 

 done was very limited. For the same reasons, as well as for the lack 

 of instructors, the large scale demonstrations that had been planned 

 had to be abandoned. 



A list is given of the commoner and more important insect pests 

 causing serious injury in various localities. These include Caloptenus 

 italicus, L., occurring in the southern districts, where, owing to the 

 favourable conditions, a large infestation of this locust was to be 

 expected in 1921 ; Aporia crataegi, L., particularly abundant in certain 

 districts, but less noticeable than in previous years owing to the 

 activities of parasites; and Agrotis segetnm, Schiff., occurring in the 

 northern parts of the district, but causing less damage than in previous 

 years, the last great infestation having occurred in 1918, when 

 11,610 acres of the winter-sown crops were destroyed. 



