477 



JoHANSEN (H.)- Los InsGcticidas y Fungicidas mas Importantes. 



[The chief Insecticide and Fiinrricide Mixtures.] — Riv. Aqric- 

 Santo Domivgo, R.D., xvi, no. 4, 3lst July 1920,, pp. 106-1 09! 



Instructions are given for preparing some of the more usual insecti- 

 cide and fungicide mixtures, which should he kept at hand on every 

 estate m readiness for the appearance of any insect or disease. 



Nagorny (P. I.) «.l' UvARov (B. p.). Ta6nimbi flnn OnpefltneHin 

 BawHtniuMXTj Bpeflmeneii m BontsHeM KynbiypHbix-b PacieHiM 



fpyaiil. [Tables for the Identification of the chief Pests and 

 Diseases of cultivated Plants of Georgia.] — MMHMCTepCTBO 

 SeMneAtnifl, Btopo Bopb6bi Cb BpeAMTenniviM CenbCKaro 

 Xo3flMCTBa. [Ministri/ of Agriculture, Bureau for the Coutrol of 

 Agricultural Pests.] Tiflis, 1920, 103 pp, 16 plates. 



These tables enumerate the chief pests and diseases of fruit trees and 

 garden plants under the name of the plant attacked. Field crops, etc. , 

 will be dealt with in a subsequent paper. A special table is given 

 showing the best time to apply the remedial measures advocated. 



Anderson (E.). The South African Locust Poison TJnion of South 



Africa Depl. Agric, Pretoria, Science Bull, lu, 1920, 18 pp. 



The chief method of combating locusts in South Africa is the use of 

 a poison made by mixing sodium arsenite solution with a sweetening 

 agent such as treacle or a solution of cane sugar. 



In view of the discovery of a sludge in the drums of concentrated 

 poison as well as the occasional difference in appearance of two lots 

 of poison, a chemical investigation of the materials used was under- 

 taken. As a result of this it is suggested that cold sodium arsenite 

 solution he placed in the contaijiers first, and the treacle added after- 

 wards. The poison should be stored in this form and not mixed until 

 lecjuired for use. An arsenite in which the ratio of sodium oxide to 

 arsenic trioxide is approximately 1 to 4 '5 is apparently the most 

 suitable for preparing the poison. 



Smith (L. B.). Potato Spraying Experiments on the Control of the 

 Pink and Green Aphid {MacrosipJium solanifolii, Ashmead). I. — 



Virginia Truck Expt. Sta., Norfolk, Bull. 29, 1st October 1919, 

 1 fig. [Eeceived 8th September 1920.] 



Details are given of experiments carried out m 1917 for the control 

 of Macrosiphum sokinifolii on potatoes [R.A.E., A, vii, 492]. 

 Nicotine sulphate and fish-oil soap at the rate of SJ oz. and 5 lb. 

 respectively to CO U.S. gals, of water are advocated as a spray. If a 

 combination spiay is required, 8 to 10 oz. of nicotine sulphate may be 

 added to 50 U.S. gals, of Bordeaux contaming 2 lb. powdered lead 

 arsenate — ^the mixture used for the Colorado potato beetle [Leptinotarsa 

 decemlineataX Nicotine must not be mixed in the same spray as Paris 

 green. 



