139 



Zacher (— ). Untersuchungen iiber Spinnmilben. [Investigations 

 on Spinning Mites.]— Mill. Biol. Reichsanst. Land- u. Forsl- 

 wirtsch., Berlin, no. 18, 15th Yrlv. Rent., 1919 October 19^0 

 pp. 121-130. 



The existing htcrature on spinning mites is reviewed, and the 

 general remedial measures and natural enemies are discussed. A 

 list of 123 food-plants attacked by various species of Tetranychns 

 is included. 



Zacher (— ). Mitteilungen iiber Vorratsschadlinge. [Information 

 about Pests of Stored Food-stuffs.]— .¥///. Biol. Reichsanst. 

 Land- n. Forstwirtsch., Berlin, no. 18, 15th Yrly Rept 1919 

 October 1920, pp. 130-139, 4 figs. 



Endrosis lactella, Schiff., and Borkhausenia psciidosprclella, Stn., 

 often occur in mills and storehouses, attacking many seed products! 

 In many parts of Germany injury to corn by Calandra granaria is 

 said to be prevented by stacking fresh hay for about 4 to 6 weeks 

 in the granaries. Experiments are now in progress to test the efficacy 

 of this method. Experiments with fluid monochlorobenzol against 

 C. granaria, L., and C. oryzae, L., are being continued, but have 

 so far not given any very promising results. Attention is drawn to 

 the apparent disappearance of Tinea granella, L., as a pest in Germany. 



Thiem (— ). Der Frostspanner und seine Bekampfung im Niederungs- 

 gebiet der Weichsel bei Marienwerder (Westpr.) im Herbst 1919. 



[Control of Cheimatobia brumata, L., in the low-lying Vistula* 

 Region near Marienwerder in the Autumn of 1919.]— Mitt. Biol. 

 Reichsanst. Land- u. Forstwirtsch., Berlin, no 18 15th Yrly' 

 Rept., 1919, Octobei 1920, pp. 139-142. 



The occurrence of the winter moth [Cheimatobia brnmata, L.l and 

 the remedial measures adopted against it, including sticky bands 

 are described. The growing of grass round the trees is advocated 

 as a temporary preventive measure during the time when this pest 

 may be expected in abundance. 



ScHERPE (— ). Die Beeinflussung der Keimfahigkeit von Samereien 

 durch die Behandlung mit gasformiger Blausaure. [The Influ- 

 ence of Hydrocyanic Acid Gas on Seed Germination.]— .l/zV^ 

 Biol. Reichsanst. Land- u. Forstwirtsch., Berlin no 18 15th 

 Yrly. Rept., 1919, October 1920, pp. 143-144. 

 As the result of experiments it has been found that an exposure 

 to hydrocyanic gas sufiicient to kill the pests of stored grain does not 

 materially affect the germinating power of seed under normal condi- 

 tions, but with increased humidity and longer exposure germination 

 may be greatly retarded. 



Zaxon (V.). Danni sul Cotone {Gossvpium barbadense) e sulla Bamia 

 {Hibiscus esculcntus) a Bengasi, prodotti da un Nottuino {Farias 

 msidana v. anthophilana). [Injur\^ of Cotton and H. csculentus 

 at Bengasi by E. insulana v. anthophilana.]— Riv. Agric Parma 

 XXVI, nos. 1-2, 7th-14th January 1921, pp. 5, 23-24. 

 Cotton and Hibiscus esculcntus at Bengasi are attacked by Farias 



insulana var. anthophilana, of which a first generation of adults appears 



