232 



thus is very injurious ; in reply to a question by N. Kulagin, the author 

 stated that the insect winters in the third, very seldom in the second 

 larval stage. 



Borodin (D. N.). BonpoCTj 6aKTepianbH0M-b MeTOflt 6opb6bi ci> 

 capaHMefi. [On the question of the bacteriological method of 

 controlhng of locusts.] pp. 37-46. 



The subject was dealt with on much the same lines as in a previous 

 paper [see this Review, Series A, ii, p. 353] and after a discussion, 

 during which it was pointed out that the advocacy of this method 

 has done much harm in creating a popular opposition against the 

 chemical method, the Congress adopted a resolution pointing out the 

 insufficient state of our knowledge on this subject and the desirability 

 of further and more thorough researches. 



Vassiliev (E. M.). Ktj Bonpocy o 6iojioriM JiyroBoro wioTbiJibKa. 



[On the question of the biology of Phlyctaenodes slic(icalis.] 

 pp. 47-51. [See this Review, Ser. A, ii, p. 465.] 



During the discussion, V. Averin pointed out that the caterpillars 

 of P. sticticalis are also known to have attacked cultivated Graminaceae. 

 N. Sacharov reported that, in the government of Astrachan, this pest 

 has three generations, some of the caterpillars also passing into a stage 

 of diapuse ; the author, in agreement with Averin, recommended 

 the control of this insect by smudge fires and troughs containing 

 molasses, as well as by digging the soil in order to disturb the pupae. 



Vassiliev (E. M.). Kts Bonpocy 6iojioriii HtKOTopbixij mejiryHOBij. 



[On the question of the biology of some species of Elateridae.] 

 pp. 52-57. [See this Review, Ser. A, ii, p. 466.] 



During the discussion, the author replying to V. Plotnikov, said 

 that he has never succeeded in rearing imagines from the larvae ; 

 A. Baranov reported that, in the government of Moscow, the pupae 

 of these pests are observed in June. 



Vassiliev (E. M.). Ktj 6iojioriM CBeKJiOBHHHoii MyxM m kt> Bonpocy o 

 6opb6'fe CTs Hero. [On the biology of Pegomyia hyoscyami, Panz., 

 and on the question of controlhng it.] pp. 58 60. [See this Review, 

 Ser. A, ii, p. 467.] 



During the discussion, N. Sacharov reported that in the government 

 of Astrachan Pegomyia kyoscyami has two generations and winters 

 in the pupal stage. In reply to S. Mokrzecki, the author said that, 

 according to his observations, a solution of barium chloride can only 

 penetrate the living tissue of leaves through wounds in their surface. 



