268 



indicated. The first treatment may be made earlier if there is no 

 danger of infestation by Cheiniatohia, and can then coincide with the 

 treatment of peaches against fungi. The same copper mixture, without 

 the arsenate, can be used for both kinds of trees. When apples only 

 are to be treated, the last two sprays are generally sufficient, unless 

 Cheiniatohia is likely to be present, in which case a first treatment 

 should be given before blossoming. Various instructions as to the best 

 method of spraying are given, with a description of suitable apparatus. 



Feytaud (J.). Essais de Bouillies mixtes pour le Traitement des 

 Arbres Fruitiers. — Ann. Epiphyties, Paris, vii (1919 & 1920), 

 1921, pp. 195-236, 5 figs. [Received 15th March 1922.] 



The advantages accruing from the use of mixed sprays for combating 

 insect pests and diseases of fruit-trees, and the substances recommended 

 for this purpose, have been discussed in another paper [R.A.E., 

 A, X, 220]. 



Chopard (L.). La Fourmi d' Argentine, Iridomyrmex humilis var. 

 arrogans, Santschi, dans le Midi de la France. — Ann. Epiphyties, 

 Paris, vii (1919 & 1920), 1921, pp. 237-266, 33 figs. [Received 

 15th March 1922.] 



The life-history and habits of Iridomyrmex humilis (Argentine ant) 

 as occurring in France are summarised, and a full account is given of 

 measures that have proved successful against it [R.A.E., A, ix, 251]. 



Feytaud ( J .) . Recherches sur I'Eud^mis et la Cochylis dans le Bordelais 



en 1918 et 1919.— .4ww. Epiphyties, Paris, vii (1919 & 1920), 

 1921, pp. 323-338. [Received 15th March 1922.] 



Weather conditions and their influence on the seasonal incidence 

 of the vine moths \_Clysia ambiguella and Polychrosis botrana] in 1918 

 and 1919 are discussed. A moderate temperature, ranging between 

 60 and 64° F., with some humidity, seems to present optimum con- 

 ditions for C. ambiguella ; higher temperatures, of 68° F. and over, 

 accompanied by dryness are unfavourable to it. The normal heat 

 and dr3Tiess of the Bordeaux region are frequently fatal to the insect, 

 which only survives in the cooler districts. This summer mortality 

 affects the older larvae of the first generation, the adults, and the eggs 

 and young larvae of the second generation. P. botrana is much less 

 influenced by temperature and humidity conditions, and seems to 

 thrive best in full summer in normal years. This preference for heat, 

 together with a high winter mortality, renders the summer generation 

 more numerous than the spring one, and produces a more regular 

 incidence curve than that of C. ambiguella. 



Vayssiere (P.). Les Inseetes nuisibles aux Cultures du Maroc. — Ann. 

 Epiphyties, Paris, vii (1919 & 1920), 1921, pp. 339-370, 8 plates. 

 [Received 15th March 1922.] 



An account is given of insects injurious to the cviltivated crops of 

 Morocco [R.A.E., A, viii, 121; ix, 57], with notes on some of the 

 insecticides that have been recommended against them. 



