36 



Rambousek (F.). Prognose der Rubenschadlinge. [A Prognosis of 

 Beet Fests. ]—Berichte V ersuchsstation Zuckerind. in Prag, 

 no. 346. (Abstract in Wiener landwirtsch. Ztg., 1921, no. 84-85.) , 



In Bohemia most beet pests, except Silpha, Atomaria, Julus and 

 wireworms, first appear towards the end of June, so that attempts 

 should be made to eUminate them before growing beet. Baits 

 should be used to ascertain their presence. After clover and fodder 

 crops there are always many beet pests ; the ploughing under of 

 clover involves many dving roots in the ground, which provide food 

 for the pests that attack beet later. In 1921 many Enchytraeid 

 worms occurred after corn and clover. These do not increase if the 

 beets are sOund, but if Melolonthid larvae and wireworms are present, 

 they multiply and complete the destruction of the beet. Heterodera 

 schachtii is gradually disappearing, as it is now unusual for one beet 

 crop to follow another. Atomaria linearis was common in 1921. 



Nilson-Ehle (H.). Ueber Resistenz gegen Heterodera schachtii bei 

 gewissen Gerstensorten. [The Resistance of some Varieties of 

 Barley to H. schachtii.']— Her editas, i, 1920, pp. 1-34. (Abstract 

 in Wiener landwirtsch. Ztg., 1921, no. 84-85.) 



Contrary to what obtains with other cereals, different varieties of 

 barley show a varying degree of resistance to infestation by Heterodera 

 schachtii, and the choice of resistant varieties is therefore a matter 

 of great economic value in districts where this Nematode abounds in 

 the soil. 



LiNDiNGER (— ). Ein neuer Weg der SchadlingsJorschung. [k New 



Road in Research on Pests.] — Naturwiss. Wochenschr., 1921, 



p. 255. (Abstract in Wiener landwirtsch. Ztg., 1921, no. 84-85.) 



This is a criticism of the work of existing plant protection institutes 



in Germany. A complete survey of the pests in the country should 



be undertaken, and the results compared. 



Friederichs (K.). Die neueren Untersuchungen iiber Rapsglanzkafer. 



[Recent Investigations on the Rape Beetle.]— Zeitschr. wiss. 

 Insektenbiol, Berlin, xvi, nos. 9-10, 11-12, 15th August and 

 15th November 1921, pp. 195-198, 236-238. 



Papers on the rape beetle, Meligethes aenens, L., published since 

 1917, and nearly all of German origin, are briefly noticed. Most of 

 these have been already dealt with [R. A.E., A, vi, 37, 93, 343, etc.]. 



Harukawa (C). Controlling the Rice-borer {Chilo simplex) by 

 Submergence. — Ber. Ohara Inst. Landiv. Forsch., Kurashiki, 

 Okavama, i, no. 5, 1920, pp. 599-628, 1 graph. [Received 18th 

 November 1921.] 



The damage done in Japan by the rice-borer, Chilo simplex, is very 

 serious, and a method of control that is both effective and convenient 

 in application has long been sought for. The idea of control by 

 submergence is not new, as Otsuka stated in 1895 that this method 

 would not be effective. Since then several experiments in flooding 

 have been made with highly conflicting results. Though not yet 

 satisfied with his own results, the author publishes them here, as he 

 thinks that some of the more important points are now explained. 



