258 



Der Khaprakafer, ein neuer Getreideschadling in Deutschland. [The 



Khapra Beetle, a new Cereal Pest in Germany.] — N achrichtenblatt 

 Deutschen Pflanzensckutzdienst, Berlin, ii, no. 1, 1st January 1922, 

 pp. 4-5. [Received 13th March 1922.] 



The occurrence in grain stores in Berlin and on the lower Rhine of 

 Trogoderma khapra. Arr., is recorded In view of this beetle having 

 become established in England, there is a danger of its doing likewise 

 in Germany. It should be reported as soon as noticed. 



Appel ( — ). Zur Karbolineumfrage. [On the Question of Carbo- 

 lineum.] — N achrichtenblatt Deutschen Pfianzenschutzdienst, Berlin^ 

 ii, no. 2, 1st February 1922, pp. 9-10. 



The differences in the results obtained with carbolineum are due to 

 variation in the composition of the preparations now sold under this 

 name. It is not simply a matter of testing the various brands and 

 noting those that prove satisfactory ; the product must be distilled 

 from hard coal, and even then the variations in the composition of 

 coal from different coal-fields, and those depending on the manner in 

 which distillation has been performed, introduce disturbing factors, 

 so that a maker's guarantee can only be of relative value. Further- 

 more, commercial brands differ widely as regards their water-content 

 and their power of emulsification. The water-content often depends 

 on the soap incorporated to help emulsification ; in a " pure " car- 

 bolineum it should not exceed 20 per cent., while in the others the 

 percentage should be about 30. A moderate water-content and 

 uniform emulsification are valuable properties. It is hoped to ascertain 

 which constituents are of insecticidal value in these preparations. 



WiLLE (J.). Die biologische Bekampfung der Blutlaus in Uruguay. 



[The Biological Control of Eriosoma lanigerum in Uruguay.] — 

 N achrichtenblatt Deutschen Pfianzenschutzdienst, Berlin, ii, no. 2, 

 February 1922, pp. 10-11. 



The information given here on the introduction of Aphelinus mali, 

 Hald., into Uruguay against Eriosoma lanigerum, Hausm., is taken from 

 a paper already noticed [R. A.E., A, x, 226]. 



Speyer (W.) & Kaufmann (0.). Leben und Schadlichkeit des Raps- 

 Mauszahnriisslers {Baris coendescens. Scop.). [The Life-history 

 and Inj uriousness of B. coerulescens.l—N achrichtenblatt Deutschen 

 Pfianzenschutzdienst, Berlin, ii, no. 3/ 1st March 1922, pp. 20-21, 

 1 fig. 



The investigations conducted at Naumburg since 1919 on the pests 

 of rape crops seem to indicate that Baris coendescens, Scop., is b}' no 

 means as injurious as is generally believed. The adult is harmless, 

 and even when several larvae infest one plant, the damage done by 

 their mines is unimportant. Much of the injury -ascribed to B. coeni- 

 lescens is due to another weevil, Ceuthorrhynchiis qiiadridens, Panz., and 

 to a flea-beetle, Psylliodes chrysocephala, L., but is distinct in character, 

 for it rarely affects the actual roots, in which the larva of B. coeru- 

 lescens mines. Oviposition by B. coendescens probably begins early 

 in spring. It is not certain that the root-collar is the place normally 

 chosen for oviposition, as the larval mines often begin lower down 

 the root. The larvae usually work in the pith downwards, but the 



