642 



infested heads of clover and from 5 to 16 per cent, of injured flowers, 

 but even these figures, giving 16 per cent, as the highest percentage 

 of destroyed flowers, cannot be regarded as serious. He is therefore 

 of opinion that there is no reason to apply any expensive remedies to 

 control these weevils. The remedy, usually recommended, of early 

 mowing of clover and the increased harvest obtained by it, has nothing 

 to do with the control of Apion, as the mowing simply increases the 

 vigour of the plants and makes the flowering coincide with the time 

 when the greatest number of pollenising insects is on the wing. The 

 necessity for paying more attention to the plants themselves and the 

 conditions affecting their power of resistance to the injuries caused 

 by insect pests, etc., is urged. 



Jatzentkovsky (E. v.). flo Bonpocy o6t> naMtHeHin toxhhkm 6opb6bi 

 Ch capaHHeBblMM. [On the question of changing the technique 

 of the control of locusts.]— « SeiyinefltnbMecKafl faaeia.)) [Agri- 

 cxdtnral Gazette], Pelrograd, nos. 28, 24th July and 29, 31st July 

 1915, pp. 789-791 and 819-821. 



The author disagrees to some extent with the views expressed by 

 B. Uvarov in his recent articles on the campaign against locusts [see- 

 this Review, Ser. A, ii, p. 65 and Ser. A. iii, p. 109] and contends. 

 (1) that there is no reason to return to the old and inferior mechanical 

 means of control ; (2) that the chemical methods still require further 

 investigation as regards the best insecticides, methods of spraying and 

 use of poisoned baits ; (3) that the use of poisoned baits, as recom- 

 mended by Uvarov, is not always more effective, nor is it less expensive 

 than spraying. 



KOROLKOV (D. M.). BntflHOHOriii KpbimOBHMKOBbIM nMJlUnblMMKT.. 



Maiepianbi no MayHeHiw BpeflHbixi* HactKoivibix-b Mockobchom 

 rySepHJll. [PristipJwra pallipes, Lepeletier [Nematus appendiculatus, 

 Hartig). Materials for the study of insect pests of the govt, of 

 Moscow.] Published by the Zemstvo of the govt, of Moscow, 

 Moscow, 1915, 43 pp., 16 figs., 3 tables of figs. 



PristipJiora pallipes, Lep., is for the first time reported as a serious 

 pest of gooseberries and currants in the government of Moscow, where 

 this sawfly did great damage to these plants in company with 

 Pteronus rihesii. Scop., in 1914. Owing to the existence of three 

 and even four generations during one year and of its partheno- 

 genetic reproduction, it may prove even more dangerous than the 

 latter species. During the whole of the summer, the author neither 

 found nor reared males ; the parthenogenesis was confirmed experi- 

 mentally, by isolating the cocoons in separate glasses containing 

 currant leaves on which the females oviposited. The various stages 

 are described in detail. The females oviposit on the lower side of 

 the leaves of gooseberries and red and white currants, but avoid 

 black currants. Pupation takes place either on the leaves, etc., 

 of the plants or in the earth, in the case of the larvae of the last 

 generation, which hibernate. Three or even four generations may 

 occur in the government of Moscow. This pest is checked by a 

 Chalcid, a species of TricJwgramma {Pentharthron). A solution of 

 Paris green in salammoniac is a good remedy against the larvae. 



