441 



MuLLER (H. C.) & MoLZ (E.). Versuche zur Ermittlung des Wirkungs- 

 wertes verschiedener Stoffe zur BekampSung der Riibannematoden 

 in Schlammerden. [Experiments to determine the Eflicacy of 

 various Substances against the Beet Nematode in Mud Soils.] 

 ^Blatter f. Zuckerriibenbau, xxviii, 1921, pp. 96-102, 144-149. 

 (Abstract in Zeitschr. Pflanzenkr. u. Gallenkunde, Stuttgart, xxxii, 

 no. 1-2, 1922, p. 63.) 



Methods for disinfecting mud soils have hitherto given unsatisfactory 

 results because the brown cysts of Heterodera schachtii are not killed 

 by the substances used. New experiments show that formaldehyde 

 at 0-25 per cent, gives a good result after 20 days, while one 

 appHcation of 0-1 per cent, sufficed with 40 days. The caustic 

 alkalinity produced by lime water 0-12 per cent, required 60 da3^s to 

 kill the Nematodes and their brown cysts. 



Baume (W.). Die Geradfluglerfauna Westpreussens. Dritter 

 Beitrag zur Kenntnis der westpreussischen Ohrwiirmer und 

 Heuschrecken. Dermaptera und Orthoptera. [The Orthopterous 

 Fauna of West Prussia. Third Contribution to the Knowledge 

 of West Prussian Earwigs and Grasshoppers.]— 5c/;ri//. naturf. 

 Ges. Danzig. N.S., xv, no. 3, 1920, pp. 144-185. (Abstract in 

 Zeitschr. Pflanzenkr. u. Gallenkunde, Stuttgart, xxxii, no. 1-2, 

 1922, p. 66.) 



A locust, native to West Prussia, Locusta migratoria ph. danica 

 {Pachytilus danicus, L.), has caused most of the damage there ; 

 L. (P.) migratoria, from South Russia, has also occurred in abundance. 

 Tachycines asynamorus, Adelg., sometimes occurs in greenhouses. 



Drenowski (A. K.). Macrolophus costalis, Fieb. Ein neuer Insekten- 

 schadling auf den Tabakpflanzen in Bulgarien. [M. costalis. 

 a new Insect Pest of Tobacco in Bulgaria.] — Rev. Inst. Recherches 

 Agronomiques en Bidgarie, Sofia, i, 1920, pp. 180-188, illustr. 

 (Abstract in Zeitschr. Pflanzenkr. u. Gallenkunde, Stuttgart, 

 xxxii, no. 1-2, 1922, p. 67.) 



Since 1912, a bug, Macrolophus costalis, Fieb., has occurred on 

 tobacco on the northern slope of the Rhodope mountains. It always 

 occurs together with Thrips communis on the veins of the under- 

 surface of the leaves. When they are harvested the larvae remain 

 on them and transform on the drying leaf, with the result that many 

 fertilised females hibernate in dwellings or sheds and oviposit in spring 

 on cuttings, with which they are re-introduced to the fields. 



MoKRv ( — ). Prave priciny rozmnozene kbeyne minsky ve stredni 

 Evrope v poslednieh leteeh. [The true Reasons for the Increase 

 of the Nun Moth in Central Europe in Recent Years.] — Spolkovy 

 casopis pro lesn., mysliv. a prirod., Prague, 1920-21, pp. 37-41. 

 (Abstract in Zeitschr. Pflanzenkr. u. Gallenkunde, Stuttgart, 

 xxxii, no. 1-2, 1922, p. 72.) 



Since 1895 only three severe winters (1895-96, 1900-01, 1901-02) 

 have occurred, and from 1911-12 onwards the winters have been 

 unusually mild. Owing to the few insects hibernating, birds, which 

 are normally the chief destroyers of the eggs and larvae of the nun 



(7392) Wt.P.6/200 1,500 9/22 Harro.v G.75 2G 



