369 



Chauvigne (A.). Action de la Chaleur pour la Destruction de la 

 Cochylis et de I'Eud^mis, en 1919. — Le Progres Agric. et Vitic, 

 Montpellier, Ixxiv, no. 25, 20th June 1920, pp. 595-597. 



The author's observation have led to the conclusion that the des- 

 truction of Clysia ambiguella and Polychrosis hotrana by the sun's heat 

 is certain when the temperature registers 122° to 132° F. during the 

 period of incubation of the eggs. This confirms the results of previous 

 investigations on this point. 



Dr. Marchal, commenting upon this statement, remarks that the 

 intense heat must coincide with the moment of oviposition and with 

 the hatching of the eggs, otherwise it has no action on the development 

 ■of the insects. This explains the differences in the action of heat in 

 various countries and seasons. 



SiCARD (H.). La Destruction des Eudemis par les Pulverisations 

 de Savon Pyrethre. — Le Progres Agric. et Vitic., Montpellier, 

 Ixxiv, no. 25, 20th June 1920, pp. 593-595. 



Following the method practised by Dr. Faes [R.A.E., A., viii, 348] 

 ■of using a pyrethrum-soap solution against Clysia ambiguella, the 

 author records the results he has obtained with this mixture against 

 Polychrosis botrana in the south of France. Contact with the insecti- 

 cide produced instantaneous death among the larvae, and a few hours 

 after treatment there were 7 or 8 times more individuals of P. hotrana 

 ■on the untreated vines than on those sprayed with the mixture. 



Feytaud (J.). Le Proces d'un Myriapode : le Blaniule mouchet6.— 



Bull. Soc. Etude Vulg. Zool. Agric. Bordeaux, xix, no. 5, May 1920, 

 pp. 33-35. 



Although the milUpede, Blaniulus guttulatus, Bosc, is generally 

 ■considered harmless to vegetation, it may, in seasons of unusual 

 -abundance, cause considerable damage, especially to the germinating 

 seeds of vegetable crops, and by wounding the tissue of various fruits 

 may cause them to decay. Its numbers can be checked by sprinkhng 

 the soil before sowing with strong salt-water, or with a solution of 

 .sodium nitrate, iron sulphate, potassium sulpho-carbonate, tobacco 

 •extract, etc., or by injecting carbon bisulphide into the ground, and 

 by the laying down of bait-traps consisting of pieces of beetroot, or 

 potato, which should be taken up and plunged into hot water to destroy 

 the miUipedes collected. 



Lesne (P.). L'Utilisation de la Chloropicrine pour la Destruction 

 des Insectes Nuisibles et des Rats. — Jl. d' Agric. Pratique, Paris, 

 xxxiii, no. 25, 17th June 1920, pp. 462-464. 



The discoveries of various investigators regarding the uses that can 

 be made of chloropicrin in the destruction of noxious insects and of 

 rats are reviewed. One of the latest apphcations of this poison is 

 to destroy pests infesting the foUage of plants without injuring the 

 .growth. The value of this discovery should be proved by its practical 

 a,pphcation. 



