298 



at almost any time throughout the year. The usual remedies consist 

 of smearing the buds with a mixture of lime and clay in soapy water, 

 the destruction of the beetles by means of bait leaves wetted with 

 sodium arsenite and placed underneath the plants, and spraying with 

 barium chloride and molasses in summer. 



Lutte centre les Sauterelles. [Locust control.] — Rev. Hortic. de 

 VAlgerie, Algiers, xx, nos. 1-2, January-February 1916, 

 pp. 31-34. [Received 9th May 1916.] 

 A circular dated 11th December 1915 instructs the local authorities 

 in Algeria as to the control measures required against a probable 

 invasion of locusts in the spring of 1916, The recommendations made 

 are based on the experience gained in preceding campaigns. Imme- 

 diately the appearance of the locusts is reported, the places where 

 oviposition has taken place must be determined by the local authorities. 

 This work must be supervised by a European who must watch for 

 the emergence of the young locusts ; these must be destroyed within 

 eight to ten days of their hatching out. This is best accomphshed by 

 spraying with an 8 to 10 per cent, solution of cresyl. Even where the 

 carriage of water is difficult and costly, spraying the young locusts 

 will prove the most economical measure in the end. One operator 

 can spray 66 gals, over 1 J acres in a day. Spraying should preferably 

 be done in the morning and in the evening. Where the above method 

 is not capable of application, it will be necessary to burn the young 

 locusts or to make use of the Ortel system. In the former case, heaps 

 of grass, etc., must be arranged at the hatching places and the young 

 locusts which have taken shelter in them may then be burnt. The 

 Ortel system of trap-holes only gives good results in loose soil in regions 

 where water and firing materials are lacking. The locusts are driven 

 into circular holes measuring about 2 feet in diameter and in depth. 

 The sides must be lined with zinc to prevent the insects from climbing 

 out and the zinc must be wiped with an oily rag several times a day. 

 When a hole is full the locusts must be crushed and removed. What- 

 ever method of control is chosen, it is important that the long 

 incubation period be fully utihsed to make all arrangements and to 

 bring up to the spot all the material required. Those who neglect 

 control are subject to penalties. A special form has been distributed 

 which is required to be filled in with information regarding the locusts, 

 their control, etc. Under certain conditions the government provides 

 supphes of cresyl ; money grants are no longer made. 



Trabut (L.). Les sauterelles en 1916. [Locusts in 1916.]— JRev. Hortic. 



de VAlgerie, Algiers, xx, nos. 1-2, January-February 1916, 



pp. 34-36. [Received 9th May 1916.] 



It is probable that Algeria will be invaded in 1916 by the wandering 



locust {Schistocerca jjeregrina, 01.) from the Sahara. Mechanical 



controls have proved unsatisfactory. Contact poisons, such as 



cresylates, heavy oils and polysulphides, are less effective than 



arsenicals. It is generally known among the natives that S. peregrina 



comes from distant regions and gives rise in the Algerian Sahara, in 



the high plateaux and in the Tell, to pink locusts which become winged 



in May, June, or July, according to the district, and are known as the 



