41 



Kleine (R.). Einfluss der Wetterlage auf das Auftreten von Gm/)Ao- 



litha dorsana, F. [The Influence of Weather on the Occurrence 

 of Cydia dorsana.'] — Zeitschr. iviss. Insektenbiol., Berlin, xv, 

 no. 10-12. 1st August 1920, pp. 259-260. 



In the course of observations on Cydia dorsana in Pomerania 

 [R.A.E., A, ix, 37], it was found that infestation is influenced by 

 rain or atmospheric humidity. Mature peas that are able to harden 

 quickly escape injury-, but heavy rain may cause hardened peas to 

 swell and softens them sufficiently to permit injury by the young 

 caterpillars. A humid atmosphere prevents hardening, with the same 

 result. Once the caterpillars are half-grown the hardened condition 

 of the peas is no deterrent to attack. \\'eather is therefore an 

 important factor in districts where pea growing is menaced by 

 C. dorsana, and such crops are risky in infested districts where the 

 heaviest rain occurs in July. Coastal districts are likewise unsuitable 

 on account of the damp atmosphere. 



KuRiSAKi (M.). A new Species and the Variations of the Wing Veins 

 of Aphididae in Japan. — Insect World, Gifii, Japan, xxiv, no. 9, 

 15th September 1920, pp. 297-301, 1 plate. 



Trichosiphnm kashicola, sp. n., attacks the tender leaves of Quercus 

 acuta and Q. myrinaefolia in Japan. The adult and nymph of the winged 

 viviparous female are here described, an English translation being given. 

 A note is also given on the importance in classification of variations in 

 the wing veins of Aphids. 



KuRiSAKi (M.). On the Hosts of Aphididae in Japan. — Insect World, 

 Gifu, Japan, xxiv, no. 10, 15th October 1920, pp. 340-341. 



The food-plants are given in Japanese of Brevicoryne {Aphis) brassicae, 

 Myziis {Rhopalosiphiim) persicae, and two species of Lachnus. 



Le Pyrethre de Dalmatie. — Rev. Agric. Afr. Xord, Algiers, no. 63, 

 15th October 1920, pp. 306-307, 1 fig. 



An account is given of the methods of culti^•ation of Pyrethrum 

 cinerariaefolium. The pyrethrum powder made from it is of great 

 importance in the destruction of Clysia ambigiiella, and in Dalmatia 

 its production is regarded from the commercial standpoint as second 

 only to that of the vine itself. 



The flowers lose about f or f of their weight in drv'ing, and 4^ lb. 

 of dry flowers make about 28 lb. of concentrated pyrethrum solution — 

 enough to treat nearly 1,100 yards of vines. 



Malpeaux (N.). La Conservation des Grains. Les Ennemis des Grains 

 emmagasin^s. The Preservation of stored Grain.] — La Vie 

 Agric. ei Riir., Pans, xvii, no. 47, 20th November 1920, pp. 315- 

 317, 3 figs. 



A popular account is given of the more important pests of stored 

 grain and the means of combating them. 



ScHRiBAux (E.). Disinfection des Graines de Coton par la Chaleur 

 seche. [The Disinfection of Cotton Seed by dry Heat.] — L'Agron. 

 Colon., Paris, vi, no. 34, October 1920, pp. 103-104. 



As wheat and beet seed resist high temperatures for a long time, 

 experiments were made with cotton seed at the Seed Experiment 



(7734— A) VVt.P1850/163 2/21 1500 D.St. (Gp. 76) B 



