348 



bureaus for the control of pests in Turkestan, as agreed at the Provin- 

 cial Interdepartmental Conference at Tashkent [see this Review, Ser. A, 

 V, p. 304] is given, and also the estimated budgets of the bureaus ^ 

 the maintenance expenses of each of which is placed at about £2,200. 

 Three local bureaus are projected, one for each of the provinces of 

 Syr-Darya, Samarkand and Fergana. The total cost of the whole 

 organisation amounts to from £7,500 to £8,000. 



T.S. capaHMeBblXlj pafiOTaxijB-b Byxapt. [On Anti-locust Measures 

 in Bokhara.]— «TypKeCTaHCKOe Ce/lbCKOe X03flMCTB0.»— ^^rncwi- 



ture of Turkestan], Tashkent, xii, no. 4-5, April-May 1917, p. 310. 

 [Received 12th July 1918.] 



This is a note recording the completion of the anti-locust operations 

 in Bokhara in 1917. Owing to the exceptional drought and the absence 

 of grass, the pests either did not hatch at all, or perished in the early 

 stages ; consequently in many localities no operations against them 

 were necessary. 



SmRNov (D.). OnbiTij onbuieHin xjionna ctpHbiMi. i^etiOM-b npoTMOt 

 nayiHHHaro Knema, ero peay/ibiaTbi, aHanns-b pocia m nnoflo- 

 HomeHifl xjionna JiiroM-b 1914 r. bi* MypraOcKOMii (6biBiiieMi> 

 FocyflapeBOMTj) MlVltHiM. [An Experiment on dusting Cotton 

 with Flowers of Sulphur against Tetranychus, tetanus, L., its 

 Results, Analysis of the Growth and Harvest of Cotton in the 

 Summer 1914 on the Murgab (late Imperial) Estate.] — «TypKe- 

 CiaHCKOe CejlbCKOe X03flilCTB0.» [Agriculture of Turkestan]^ 

 Tashkent, xii, nos. 4-5, 7-8, April-May, July- August 1917, 

 pp. 214-226, 423-428, 10 figs. [Received i2th July 1918.] 



These are the first two instalments only of this article on the effect 

 of sulphur on Tetranychus telarius and the conclusions arrived at 

 are incomplete. 



Former experiments by the author and K. E. Demokidov, under- 

 taken in 1912-13, estabhshed the fact that dusting with sulphur 

 is an effective remedy against Tetranychus telarius, being especially 

 destructive to the eggs, which turn red and shrivel within a few days 

 after the treatment. Laboratory experiments show that eggs of this 

 mite are affected in the same way by the action of sulphur dioxide gas. 



Although the results of these experiments seemed conclusive, it 

 was found necessary to repeat them under various conditions of 

 cotton cultivation and at different seasons. The chief damage done 

 by the mites consists in the dropping of buds and flowers, while the 

 defoliation of the plants is harmful only in June and July, and this 

 occurs only exceptionally. Further, various enemies greatly reduce the 

 numbers of the mites towards the end of July, and it would therefore 

 appear that the end of June is the most suitable time for applying 

 the sulphur. These natural enemies include larvae and adults of 

 Scymnus and Coccinella, larvae of Chrysopa, a Cecidomyid, the larvae 

 and adults of Anthocorid bugs, and a small spider. 



In 1912-13 it was found that the mites winter on the under-side of 

 the leaves, and consequently an outbreak in one year is followed 

 by infestation of the plants next year, if sown on the same field. Before 

 the appearance of the cotton seedhngs the increase of the mites depends 



