106 



Experiments were conducted to test the effect of various mixtures 

 on the leafho})pers, inchicHng Bordeaux mixture, Bordeaux with hme 

 and with lead arsenate, and china clay with soap. The results, 

 recorded in tables, show that all of the spraying mixtures gave con- 

 siderable protection from the adults. The heavy washes of china 

 clay or lime proved somewhat better repellents than the other spraying 

 mixtures. The china clay, however, was easily washed off by rain, 

 while lime, applied in the amounts specified, caused injury to the 

 foliage. It is possible that smaller amounts of lime might give the 

 desired effect without injury. 



Green (A. W.). Grass-grub Control. Experience at Ruakura. — 



N.Z. Jl. ' Agric, Wcllinqion, xxi, no. 4, 20th October 1920, 

 pp. 174-175. 



Odontria Zealand ica (grass grub) has been successfully controlled in 

 New Zealand by concentrating cattle on the infested area, the grubs 

 being killed by the trampling of the animals. This method is advocated 

 when the infestation is contined to small areas. 



Z.\cHER (F.). Beitrage zur Kenntnis der westaf rikanischen Pflanzen- 

 sehadlinge. [Contributions to the Knowledge of West African 

 Plant Pests.] — Tropenpflanzer , Berlin, xviii, nos. 9-10, October 

 1915, pp. 504-534, 35 figs. [Received 6th January 1921.] 



This paper contains a list of 82 injurious insects from Togoland, 

 the injury being described in each case. Peacock's paper on pests in 

 South Nigeria [R.A.E., A, ii, 106] is referred to at length. The 

 species of Sylepta recorded from the timber tree, Monotes kerstingi 

 [R.A.E., i, 350] is closely allied to 5. inanitalis, Led. 



A description is given of Tliaiunatotibia roerigii, gen. et sp. n. — 

 the Togo bollworm of cotton. 



Pests from Kamerun comprised : — A Bostrychid pest of Hevea, 

 Xylopertha picea, 01., on which a Clerid, Cylidrus fasciatus, 01., and 

 a Histerid, Teretriosoma saginatum, are predaceous ; Gonocephalum 

 {Opatriim) simplex, F., on tobacco ; Stenotarsus guineensis, Gerst., 

 on Hibiscus ; and Myllocerus amoenus, Hartm., of which the descrip- 

 tion is given. This last beetle also occurs in Fernando Po. 

 i The Lepidopterous pests of cacao in South Kamerun are Leipoxais 

 peraffinis, HolL, Nudaurelia dione, F., and Euchromia lethe, F. The 

 caterpillars of Prolatoia sjostedti, Aur., are recorded on Manihot 

 iitilissima, of which plant no pests had previously been known from 

 Africa. Diacrisia rava is common on palms. 



Moll ( — ). Der Schutz des Bauholzes in den Tropen gegen die Zer- 

 storung durch die Termiten. [The Protection of constructional 

 Timber in the Tropics against Destruction by Termites.] — 

 Tropenpflanzer, Berlin, xviii, no. 11, November 1915, pp. 591- 

 605, 10 figs. [Received 6th January 1921.] 



Information is given on the kinds of wood that resist the attack 

 of termites, and on commercial methods for impregnating woods with 

 tar-oil, or with arsenic mixed either with mercury perchloride or the 

 Wollmann mixtvn-e used in German mines. 



