535 



The remedial measures advocated are fumigation with hydrocyanic 

 acid gas and spraying with nicotine or paraffin emulsions, the formulae 

 for which are • | to 1 oz. (fluid measure) mcotme f P^^jf^"'^^ \^^ 

 soft soap and 10 gals, water; 2 pts. paraffin and 1 lb soft soap to 

 10 gals water. Plants should be fumigated immediately before 

 despatch to the planting area. To prevent the development o spring 

 forms of Chermes, fumigation should be carried out before 1st April. 

 Spraying is less effective than fumigation in the case of nursery plants^ 

 At least three applications should be made at intervals of from a week 

 to ten days, before the end of March. Young plants may be freed from 

 the wintering forms of CJiermes by dipping in a solution of 1 lb. soft soap 

 to 1 gal. of water in the autumn and early spring. 



Schroder (C.) and others. Handbuch der Entomologie.-/m« 



Cxustav Fischer. (Review in Ent. Mitt., Berlin, x, no. 5, 1st 



September 1921, p. 162.) 

 \ further part of this work [R.A.E., A, ix, 109] dealing with the 

 genitalia, flight mechanism, palaeontology and phylogeny of insects 

 has been issued. 



• Tr\but (— ) Un Echo de la Lutte contre les Sauterelles en Crau. 



—Bull Agric. Algerie-Tunisie-Maroc, Algiers, xxvii, no. 1, 

 July 1921, pp. 126-127. [Received 6th September 1921.] 



The anti-locust league in Crau in the south of France [^•^•^•' 

 \ ix 137] has been informed that severe damage threatened by 

 locusts in June 1921 was entirely prevented by a poisoned bran bait 

 the user of which has suggested chopped straw or other suitable material 

 as a substitute for the expensive bran. With reference to this question 

 of substitutes the league officials point out that shells and other refuse 

 of ground-nuts are excellent but of limited application, as it may be 

 difficult to obtain quickly a sufficient supply m an emergency. 



Cohen Stu\rt (C P.). De Theezaadtuinen van Java en Sumatra. 



[The Tea Seed Gardens of Java and Sumatra.]— Me^^^^ ProefsL 



Thee, Buitenzorg, Ixxv, 1921, 32 pp., 8 plates. (With a Summary 



in English.) 



The tea-seed fly, Adrama determinata, is a dangerous pest in seed 



gardens \R.A.E., A, iii, 434], and another very serious enemy is a 



Pentatomid bug, Poecilocoris hardwicki, which causes white spots 



in the cotyledons, involving a large loss of seed [R.A.E., A, vm, 45J , 



ix, 369]. 



Ledeboer (F.). Gelestrepenziekte. [Mosaic Disease.]— -V^c/^^. Proefst. 

 Java-Suikerindustrie, Soerahaya, 1921, 2 pp. 

 In view of Brandes' work on the transmission of sugar-cane mosaic 

 disease by insects \R.A.E., A, vhi, 370] experiments have been made 

 at the Cheribon Station. Brandes used Aphis maidis, a species 

 common in West Java on maize, sorghum and millet, but very rare on 

 sugar-cane. For this reason other species were used as well as 

 A. maidis, and it appears that the green leaf aphis, A sacchan, 

 Zehnt., can carry infection from diseased to healthy plants. A sacc/mn 

 is quite common on sugar-cane, but not so much so as to be dehmtely 



