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purpose was greater than that used agamst locusts and that the spraying 

 was repeated many times on the same spot. Neither of these con- 

 siderations apphes to the campaign against locusts, and even should 

 further research confirm the injurious effects of sodium arsenite to 

 plants, its value against locusts would not be affected owing to the 

 recent practice of using it in poisoned baits instead of in sprays. 



SHTOMonorMMecKoe coBtiMaHie npM AenapraMeHTt seivineAtnifl. [An 



Entomological Conference at the Department of Agriculture.] 

 — « SewinefltnbMeCKan ra3eTa.» [The Agricultural Gazette], 

 Petrograd, no. 21 (137), 3rd June 1916, p. 594. [Received 5th 

 December 1916.] 



An entomological conference took place at the Department of 

 Agriculture at Petrograd on 12th May 1916, at which the following 

 subjects were discussed :— (1) The position of the entomological experts 

 of the Department and their part in practical local work ; (2) the 

 scientific questions that could be studied during campaigns against 

 large outbreaks of pests and by whom they ought to be carried out ; 

 (3) the control of those pests which have as yet been insufficiently 

 studied and the steps necessary to render it luore complete ; (4) the 

 subjects to be dealt with in the next j)ublications of the Department ; 

 (5) the organisation of pubhcations of the various local stations so as to 

 prevent overlapping ; (6) the training of experts in entomology ; (7) 

 the better organisation of the control of pests ; and (8) the establish- 

 ment of new stations and the co-ordination of their work. 



RossiKov (K. N.). BeceHHJM Bpan> KanycTbi— KanycTHafl 6noxa h 

 npoCTtMluie cnoco6bl 6opb6bl Cl. H8M. [The Spring Pests of 

 Cabbage — Flea-beetles and the simplest Remedies for their 

 Control] — « SewiJiefltnbMeCKafl ra3eTa.» [The Agricultural 

 Gazette], Petrograd, no. 22 (138), 10th June 1916, pp. 602-606, 

 6 figs. [Received 5th December 1916.] 



Cabbages in the government of Petrograd, as well as in No\'gorod. 

 Pskov and Tver, suffer a great deal from insect pests, especially in 

 spring. In 1913 and again in 1914 and 1915 some 75 per cent, of the 

 crop was destroyed. The chief damage was done by Phyllotreta spp., 

 especially P. atra and P. nemorum. The adults hibernate and appear 

 early in spring on various cruciferous weeds, on which they are able to 

 live in the absence of suitable cultivated plants. These weeds must 

 therefore be destroyed some time before transplanting cabbages. 



Only one generation occurred in 1914 in Petrograd, and this appears 

 to be the rule, although there are two or three in southern Russia. 

 The most favourable years for the multiplication of these beetles are 

 those with a hot, dry summer and a warm, dry autumn. Control 

 experiments were carried out in one market-garden in 1914, and for this 

 purpose beds of cabbage were divided into 12 separate plots and each 

 of them subjected to separate treatment. These were powdered with 

 various substances, of which the most effective and most easily handled 

 were ashes, road-grit, lime, basic slag and sawdust. Trap crops of 

 summer cabbage, kohl-rabi and turnips were also found to be of some 

 value. 



