387 



De Waal (M.). Priifung des insektiziden Vermogens der Kompositen, 



insbesondere des Flclcninm aiilumnale, C. [Tests of the Insec- 

 ticidal Properties of Compositae, especially H. cititinnnalc.] — 

 Pharmac. Weekbl., 1920, 1100-1107. (Abstract in Cenlmlbl. 

 Bakt., Paras. Infcktionskr., Jena, lite Abt., Ivi, no. 5-13 26th 

 May 1922, p. 199.) 



Finely ground, dry powders of sabadilla seed [Vcratnim sabadilla], 

 cevadin [an alkaloid from sabadilla] and insect powder affect the 

 motor nerve system. Dutch ChrysantJiemmn cinerariacfoliiim and 

 Pyyethritm roseitm have a marked 'effect, while the blossom powder 

 of Hclcniiim autmnnale is weak in its action. If, however, the essential 

 oil from the last-named is mixed with Althaea root, a very deadly 

 product results. 



Nechleba (— ) Versuche der Bekampfung der Nonne mit ehemisehen 



Mitteln (Insektiziden). [Experiments in combating the Nun 

 Moth with Insecticides.] — Wien. allgem. Forsi- il Jagdzeitg., 

 xxxix, 1921, p. 174. (Abstract in Centralbl. Bakt., Paras'. 

 Infcktionskr., Jena, lite Abt., Ivi, no. 5-13, 26th May 1922 

 p. 210.) 



The conclusion reached is that insecticides are not of practical 

 value against the nun moth [Liparis monacha]. The larvae show 

 great resistance to respiratory, stomach and contact poisons. 



Vekestchagin (B.). MaMCKiii >KyK-b w Mtpbi BopbSa ci. hmmi.. 



[Melolontha niclolontha and its Control.] — C|)ypHMKa [Fiirnika], 

 Kishinev, v, no. 15-16, 23rd April 1922, p. 14. 



Melolontha melolontha occurs in great abundance every third year 

 in Bessarabia, and a large number of adults are expected in 1923. 

 A brief account is given of its life-history and of remedial measures ; 

 the latter include collection of adults and larvae, the use of trap crops,' 

 and destruction of the larvae by means of carbon bisulphide, etc. 



Rosen (H. R.). The Mosaic Disease of Sweet Vot?iio%^.~ Arkansas 

 Agric. Expt. Sta., Favcttevillc, Bull. 167, April 1920, 10 pp. 

 5 plates. [Received 30th May 1922.] 



The sweet potato, Ipomoea batatas, is one of the most important 

 crops in Arkansas. In investigating the mosaic disease affecting it, 

 insect transmission was subjected to a severe test in the greenhouse! 

 A heavy infestation of Aphids of two different species, both on the 

 diseased and healthy plants growing alongside each other, with 

 runners from each overlapping, failed to show any transmission of 

 disease from affected to healthy plants. Mealy-bugs, whitefiies and 

 red spiders were also present in abundance. It is possible that 

 an infected plant may not show the disease, so that proof is not 

 forthcoming until its roots are used for seed purposes. 



Fields [W. S.) e^- Elliott (J. A.). Making Bordeaux Mixture, and 

 some other Spraying Vvo\Am\s.-~ Arkansas Ai^ric. E.xpt. Sta 

 Fayettcvillc, Bull. 172, Julv 1920, 12 pp., 1 plate. [Received 

 30th May 1922.] 



As regards the preparation of Bordeaux mixture the work done 

 IS acknowledged to be largelv a duplication of that by l^utler in New 

 Hampshire [R.A.E., A, iii, 518]. The following are the authors' 

 general conclusions :— The best method of mixing the ingredients in 



