170 



Vayssiere (P.). L 'Invasion du Criquet Marocain en Crau en 1920. — 



Separate from C.R. Acad. Agric. France, 2nd June 1920, 6 pp. 

 [Received 24th January 1922.] 



This information with regard to the measures undertaken for the 

 destruction of Dociostaurus maroccamis has been noticed elsewhere 

 [R.A.E., A, ix, 4031. 



Vayssiere (P.). Observations Biologiques sur Dociostaurus maroc- 

 canus, en Crau. — Bull. Soc. Zool. France, xHv, 11th November 

 1919, pp. 359-363. [Received 24th January 1922.] 



A brief account is given of the observations made during 1919 on 

 the oviposition, flight and other habits of Dociostaurus maroccanus 

 [cf. R.A.E., A, vii, 432]. 



Smith ( — ). Lutte centre les Pucerons. — Rev. Hortic. Algerie, Algiers, 

 XXV, no. 3, April-May 1921, p. 60. [Received 24th January 

 1922.] 



Aphids are killed in a few minutes by the application of a dust 

 consisting of 100 parts of powdered lime to 30 parts of tobacco 

 powder. This mixture is also very effective against j^oung grass- 

 hoppers if applied within two hours after hatching. Either powder 

 used alone proved ineffective, and no advantage was obtained by an 

 increased amount of tobacco. 



Verlot (J. B.). Emploi de I'Appareil Lance-Flammes pour la Destruc- 

 tion des Criquets. — Vie Agric. & Rur., Paris, xx, no. 3, 21st 

 January 1922, pp 50-52, 3 figs. 



A flame-throwing apparatus recommended for use in the destruction 

 of locusts is described and illustrated. 



Riviere (G.). Le Tigre du Poirier. — //. Soc. Nat. Hortic. France, 

 Paris, xxii, December 1921, pp. 402-403. 



Stephanitis {Tingis) pyri is recorded as damaging pears in various 

 localities of the Seine-et-Oise district. All varieties are attacked when 

 grown as wall fruit with an eastern or southern aspect, the injury being 

 usually confined to wall trees. Remedial measures in the form of 

 insecticides should be applied very early in the morning. Tobacco 

 juice, even in weak solutions, has given good results provided that the 

 jet is directed upwards so as to reach the bugs on the lower surface 

 of the leaves. 



Catan (M. p.). El Diaspis pentagona en nuestros Arboles frutales. 



[Diaspis pentagona on our Fruit Trees.] — An. Soc. Rur. Argentina, 

 Buenos Aires, Iv, no. 20, 15th October 1921, p. 759. 



The increase of the mulberry scale, Diaspis pentagona, Targ., in 

 Argentina in 1921 renders it necessary that both artificial measures 

 and the natural control afforded by Prospaltella berlesei should be 

 fully utilised. Both forms of control were successfully employed in 

 the past, but were afterwards neglected. In some districts P. berlesei 

 has eradicated the scale and has itself disappeared in consequence. 



