July, 1909 



THE CANADIAN HORTICULTURIST 



ibi 



I 



Arsenate of Lead 



Editor, The Canadian Horticulttjrisi : 

 have noticed with considerable interest 

 le articles in the June issue of your val- 

 ible paper in reference to spraying, and 

 re wish to compliment The Canadian Hoe- 

 ICULTURIST on the excellent campaign it is 

 )nducting to actively bring the attention 

 growers to thorough and effective spray- 

 ig. 



There have naturally been many conflict- 

 ig opinions with regard to the proper pois- 

 ons to use for the destruction of leaf-eating 

 isects. Each poison has its strong sup- 

 (orters, but the majority of experts and 

 Authorities throughout Canada and the 

 United States have adopted arsenate of 

 lead as a safe and sane spray. 



The writer has noted an article in your 

 recent issue advising the essential specifi- 

 cations for arsenate of lead. It may be of 

 interest to your readers to know that we have 

 been conducting an active campaign in tht 

 United States for the past two years for a 

 National Pure Insecticide and Fungicide 

 Act along the lines of the Pure Food and 

 Drug Act. This bill was drawn and father- 

 ed by the Association of Economic Ento- 

 mologists, assisted by the OfiBcial Association 

 of Agricultural Chemists. The more rep- 

 resentative manufacturers of the various 

 insecticides and fungicides have given this 

 agitation their strongest support, although 

 naturally there has been considerable op- 

 position from some quarters. A section from 

 the bill with regard to arsenate of lead is 

 quoted herewith : — 



"Section 7. That for, the purpose of the 

 .\ct an article shall be deemed to be adul- 

 terated — in the case of arsenate of lead : 



"1. If it contains more than 50 per cent, 

 of water ; 



"2. If it contains total arsenic equivalent 

 to less than 12% per cent, of arsenic oxide 

 (As 2 05); 



"3. If it contains arsenic in water solubl* 

 forms equivalent to more than 0.75 per cent 

 or arsenic oxide (As 2 O5) ; 



"4. If any substances have been mixed and 

 packed with it as to reduce, lower or injur- 

 iously affect its quality or strength, provided 

 however, that extra water can be added to 

 lead arsenate (as described in this para- 

 graph), if the resulting mixture is labelled 

 "Lead Arsenate and Water," the percent- 

 age of extra water being plainly and cor- 

 rectly stated on the label." 



The above is lowest form of lead arsenate 

 which will be permitted to be sold as such 

 under the meaning of this Act. 



In the gypsy and brown tail moth infested 

 area tributary to Boston the Government 

 and state departments, who have supervis- 

 ion of the work for the suppression of these 



FOR SALE AND WANT 

 ADVERTISEMENTS 



n 



WEST fi.NI) GREKNHOUSES, Peterboro. for sale 

 or ti rent. In good condition and well equip- 

 ped for a larsre trade. Is doing a Rood pay- 

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BRITISH COLUMBIA LANDS.— Handsomely Il- 

 lustrated catalogue of apple and farm lands 

 in B. 0. Mild climate, rich soil, cheap lands. 

 Write F. J. Hart & Co., Limited, Vancouver. 

 Es tablished 1891. 



IF YOU WANT a position, want extra help or 

 have a surplus lot of stock you want to get 

 rid o f, advertise in this coltimn. 



WANTED LADIES to do plain and light sewing 

 at home; whole or spare time; good pay; 

 work sent any distance; charges paid; send 

 stamp for full particulars. National Manufac- 

 turing Co., Montreal. 



WANTI;l) — Persons to grow mushrooms for us 

 at home. Waste space in cellar, garden or 

 f.Trm can he made to yield $15 to $25 per week. 

 Scn'l for illustrated booklet and full particu- 

 lars. Montreal Supply Co., MontreaL 



moths, after very careful investigations are 

 demanding the following specifications : 



"1. Not less than 50 per cent, actual lead 

 arsenate ; 



"2. Total arsenic equivalent to not less 

 than 15 per cent, arsenic oxide (As 2 O5) ; 



"3. The material must not contain ar- 

 senic in water soluble forms equivalent to 

 more than 0.75 per cent, arsenic oxide (As 

 2O5); 



"4. The arsenate of lead to contain no 

 injurious or inert ingredients." 



These latter specifications as required in 

 the biggest consuming field in the country 

 have been found to be essential and were 

 drawn by the best experts in the work. Only 

 a few of the manufacturers this season have 

 been able to furnish a product that will 

 uniformly conform to the above specifica- 

 tions. 



I note that in a recent article in your 

 paper it was advised not to buy any arsen- 

 ate of lead, unless it had a guaranteed an- 

 alysis of at least 16 per cent, poison. We 

 presume that by this the party meant at 



least 16 per cent, arsenic oxide. This is a 

 very well-taken point, but is not wholly ne- 

 cessary as 15 per cent, arsenic oxide will 

 destroy any leaf-eating insect if properly 

 applied. Therefore*, if a brand of arsenate 

 of lead is offered which is guaranteed to 

 contain at least 15 per cent, arsenic oxide, 

 then the essential specifications which should 

 be required are that the material be prop- 

 erly combined with lead oxide, so that it 

 may have sufficient carrying and adhesive 

 qualities, and still more important that it 

 have less than 0.75 per cent, of soluble ar- 

 senic. 



Such a guarantee is offered by The Gras- 

 selli Chemical Co., on Grasselli brand, which 

 not only covers the actual arsenic oxide con- 

 tents, but also covers every essential point 

 which is necessary to make up a uniform 

 product of the highest quality. A good 

 motto to always have before one is : For 

 effective spraying, obtain the best material, 

 beat the bugs to the foliage, and above all, 

 be thorough." — R. G. Harris, Cleveland, 

 Ohio. 



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Write 



for 



information 



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Canadian Branch : 88 King St., St. Jacob's, Ont. 



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