IMPERIAL BUREAU OF ENTOMOLOGY. 



E E V I E W 4^* 



APPLIED ENTOMOLO G Y^!!iJ!ji!!i 



Series A. 



Vol. VII.] [1919. 



EicHTER (H.). Ueber Lebensweise und Bekampfung des Nutzholz- 

 borkenkafers. [The Life-history and Control of the Timber Bark 

 Beetle, Xylcterus lineatus, Oliv.] — Forstwissenschftl. Centralhlait, 

 Berlin, xl, no. 7, July 1918, pp. 241-244. 



Very little appears to have been published relative to the hfe- 

 history of Xyloterus lineatus, Oliv., hence this record of observations 

 made subsequent to the windbreak disaster in -January 1916, in the 

 Bavarian district of which the author was chief forester. The main 

 part of this break was 3 miles in length by 220-330 yards in width 

 and included heavy spruce and fir timber. By August 1916 all the 

 fallen timber over 3 inches in diameter had been barked and stacked, 

 but the stumps could not be barked by that date. In the following 

 year it was noticed that stem wood in felling places about |-1^ mile 

 from the windbreak were more severely infested than usual by 

 Xyloterus lineatus, Oliv. An investigation of the windbreak stumps 

 (which had been raised in the summer of 1917 by means of explosives) 

 showed that those in the principal area were only very slightly infested 

 by this beetle and other pests, whereas stumps in the small breaks 

 on either side were attacked by X. lineatus to a much greater degree. 

 They appeared to be preferred as breeding places on account of the 

 moisture present, the trunks in the main area being very dry as a result 

 of exposure to sunshine. Further observations made in 1918 on 

 timber imder similar conditions seem to confirm the assumption that 

 this beetle is careful in the choice of its breeding place. Preventive 

 and destructive measures must therefore be very carefully applied 

 in the case of small breaks or in areas where natural re-stocking is 

 the practice. In places where there has been no natural re-stocking 

 the speedy removal of stump wood is a good preventive measure ; 

 but in those where young growth has already established itself it is. 

 necessary that all new stumps should be barked as early as possible, 

 for after a short winter the flight period begins early in March, so that 

 the emergence of the new beetles may be expected early in June. 

 Therefore if felling is done in winter, the stumps should be barked 

 immediately after felling from December to February. In localities 

 where a great increase of X. lineatus is feared an efficient preventive 



(C529) Wt.P2/137. 1,500. 1.19. B.&F.,Ltd. Gp.11/3. A 



