304 



Investigations with regard to the artificial control of the larvae 

 and the adults have also been continued. Under certain conditions 

 a contact spray of a sodium soy bean soap has given satisfactory' 

 results against the adults. 



Moore (W.). The Reaction of the Japanese Beetle to Arsenical Spray 



Deposits. — //. Econ. Ent., Geneva, X.Y., xv, no. 1, Februarv 



1922, pp. 67-71. 

 From the experiments here described, which were carried out in 

 1920 and 1921, it is evident that Popillia japonica, Newm., is repelleci 

 by lead arsenate as a result of the toxic effects produced by it. A 

 certain percentage of the beetles may, however, be killed under field 

 conditions by the use of large quantities of the poison evenly distri- 

 buted over the foliage ; in the case of sprays this result may be obtained 

 by the use of flour, glue or gelatin. These materials probably increase 

 the efficacy of the poison by coating the particles of the arsenical. 

 The efficacy of arsenicals for large-scale control in the field has still 

 to be proved. 



S.wDERs (G. E.) & Kelsall (A.). Cheaper Arsenicals and their Use. 



— Jl. Econ. Ent., Geneva, N.Y., xv, no. 1, Februarv 1922, 



pp. 71-75. 

 The efficiency of calcium arsenate and white arsenic as compared 

 with other arsenical products is discussed. Calcium arsenate cannot 

 be safely used alone or in combination with dusting sulphur on apple 

 or other tender foliage, but with these exceptions, it is equal or superior 

 to lead hydrogen arsenate for ordinary- uses. In using lead arsenate 

 the greatest safety is obtained by adding about 2 lb. of hydrated 

 lime to 1 lb. of dry lead arsenate in water before adding to the 

 lime-sulphur solution, and 2 to 3 lb. of hydrated hme should 

 be used to every pound of calcium arsenate. Both may be put 

 directly into the hme-sulphur solution. For use in alkali sulphide 

 and polysulphide solutions calcium arsenate is superior to all other 

 arsenicals. It is also the best material for dusting on such crops as 

 potatoes, cotton, etc. The efficacy of white arsenic as an insecticide 

 or for use in poison baits depends chiefl}' on the fineness, purity being a 

 secondary consideration. A quick reacting material should be used 

 with an even fineness and capable of passing a screen of 200 meshes 

 or more to the inch. One pound of white arsenic and 1 lb. of 

 hydrated lime mixed with 10 imperial gals, of water in which a 

 sack containing 10 lb. of crystal copper sulphate has been suspended, 

 has been used with success on potatoes and apples. The mixture 

 should be stirred occasionally until the copper sulphate has dissolved. 

 This poisoned stock solution is diluted and added to a hme solution 

 that is equally diluted. For potatoes it was used in the strength of 

 4 : 4 : 40 and 5 : 5 : 40 and for apples 3 : 10 : 40. The cost of copper 

 arsenic dusts may be reduced by substituting burned lump lime for 

 hydrated, finely crystallised copper sulphate for dehydrated, and 

 white arsenic for calcium arsenate. 



He.\dlee (T. J.) & Rudolfs (W.). Some further Experience with 

 Contact Dusts. — //. Econ. Ent., Geneva, N. Y., xv, no. 1, February 

 1922, pp. 75-81. 

 The work here described was carried out against the pink and green 



aphis, Macrosiphum solanifolii, under field conditions. The two great 



