261 



on a large scale) showed it to be very much inferior to carbon bisul- 

 phide. Sulfoergethan, which aims at destroying the pests without 

 injuring the vines, also proved unsatisfactory, but the composition 

 and method of application of the latter have been modified, and further 

 tests are being made. 



Blunck ( — ). Ueber den Massenwechsel des grossen Kohlweisslings 



bei Hamburg. [On the varying Abundance of Pier is brassicae, L., 

 around Hamburg.] — Mitt. Biol. Reichsanst. Land- u. Forsi- 

 wirtsch, Berlin, no, 21, pp. 182-184. [Received 13th March 

 1922.] 



Even after a year in which the caterpillars had been abundant 

 the spring generation of Pieris brassicae, L., was scanty around 

 Hamburg. This was due less to unfavourable climatic conditions than 

 to destruction by natural enemies, which begins with infestation 

 by Apanteles glomeratus, often helped by Polynema ovular um 

 and Pteromalus puparum, and is continued by innumerable birds. 



Blunck ( — ). Bekampfung der Kohlblattlaus mit Spiritusseifenwasser 

 und Venetan. [Combating the Cabbage Aphis with Alcohol- 

 soap and with Venetan.] — Mitt. Biol. Reichsanst. Land- 

 ti. Forstwirtsch., Berlin, no. 21, December 1921, pp. 185-186. 

 [Received 13th March 1922.] 



A spray containing 3 parts white soft soap and 5-6 parts of methyla- 

 ted spirit in 91-92 parts water has proved very satisfactory against 

 cabbage aphis [Brevicoryne brassicae], attacking cabbages, and did 

 no harm to the plants. With a better quality of soap, 1^ parts each of 

 soap and spirit gave equally good results. 



Blunck (— ). Hederich- und Rapsglanzkafer, Meligethes viridescens, 

 F., und aeneus, L. [The Radish and Rape Beetles.] — Mitt. Biol. 

 Reichsanst. Land- u. Forstivirtsch., Berlin, no. 21, December 

 1921, pp. 187-189. [Received 13th March 1922.] 



Meligethes viridescens, F., hitherto considered to have a similar 

 life-history to that of M. aeneus, L., differs in some respects. In 

 Germany it occurs chiefly on Raphanus spp., whereas M. aeneus 

 occurs on Raphanus, Sinapis and Brassica indifferently. 



Speyer ( — ). Der Kohlblattrtissler {Ceuthorrhynchus leprieuri a. 

 riibsaameni, Kolbe). [The Cabbage Leaf Weevil.] — Mitt. Biol. 

 Reichsanst. Land- u. Forstwirtsch., Berlin, no. 21, December 

 1921, pp. 189-194, 3 figs. [Received 13th March 1922.] 



In Thuringia in spring and autumn the leaves of rape and 

 turnip are infested with galls due to oviposition by Ceuthorrhynchus 

 riibsaameni, Kolbe. The adults appear in mid-August and oviposit 

 between September and April, with a break in winter, during which 

 they shelter in hedges or among the fallen leaves in tvoods. Most 

 of them die in April. The larvae feed on the gall-tissues and bore 

 into the leaf -stems. They pupate in an earthen cell in the ground. 

 After emerging in June the young adults aestivate in hedges and 

 woods. The females require a further feeding period before ovi- 

 position. Frosty weather kills many of the larvae, while a parasite. 



