February, 1909 



THE CANADIAN HOETICULTURIST 



43 



Prepared Lime-sulphur 



A recent circular issued by the Georgia 

 State Board of Entomology deals with 

 various materials used for the control of 

 San Jose scale. Among them is mentioned 

 a prepared lime-sulphur solution that was 

 used in experiments with good results. 

 Orohardists and others in Canada who have 

 tested this or a similar preparation are 

 requested to tell their experiences with 

 same, through the columns of The Cana- 

 dian Horticulturist. The following val- 

 uahle contribution is from the pen of 

 Prof. Wm. Lochhead, of Macdonald Col- 

 lege, the pioneer investigator in matters 

 that pertain to the San Jose scale and its 

 control in Canada : 



"Regarding the value of the prepared 

 lime-sulphur solution mentioned in circular 

 8 of the Georgia State Board of Entomology 

 by Messrs. Worsham and Chase, I cannot 

 say much one way or the other, as no ex- 

 periments, testing this preparation, have 

 been made in Canada, so far as I am aware. 

 I may say candidly at first blush that I am 

 disposed to vote against it, or rather to go 

 very slowly in the matter after all our ex- 

 periences in the preparation of the lime- 

 sulphur mixture in the early fight against 

 the San Jose scale in Ontario, but my dis- 

 position does not affect the Georgia results. 



"I remember quite well a discussion at 

 the 1902 meetings of the Entomological 

 Society of Ontario when this question of a 

 prepared lime-sulphur solution was treated 

 quite fully by Mr. W. E. Saunders, Dr. 

 Fletcher, Prof. C. C. James, Mr. Geo. E. 

 Fisher and myself. (See Report Ent. Soc. 

 1902 pp. 20-21). We were convinced in 

 those days that the lime-sulphur mixture 

 (which is largely a mixture of different sul- 

 phides of calcium) was only effective when 

 it was first prepared, and while it was still 

 hot. When the solution cools, crystals 



separate out; but we cannot stir it up 'nor 

 can we restore it to life by cooking, nor 

 will it stick when it is put on the trees.' 

 (Fisher). 



"Mr. W. E. Saunders remarked at that 

 meeting that a sulphide of calcium prepara- 

 tion has been in use in the drug business 

 for a long time as a remedy for skin dis- 

 eases, and that at the strength it is made 

 no crystals separate out in cooling. We 

 were then under the impression that we 

 knew very little about the properties of the 

 various lime-sulphur compounds, and the 

 chemists since that time have not added 

 materially to our knowledge. 



"It is quite possible then that the Georgia 

 preparation is a good one, but it has not 

 been proven to 'be effective at all times, on 

 all trees, and in all localities. It was tried 

 in February, 1908, and gave excellent results 

 as a spring treatment. More confirmative 

 evidence is needed before it should be given 

 to the public as a safe, cheap and effective 

 remedy for the San Jose scale." 



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SEEDS 



Use Arsenate of Lead. — Many experienced 

 fruit growers are now using arsenate of lead 

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 They have learned that it is more certain in 

 its results and that it will not burn foliage. 

 The active principle of arsenate of lead is 

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 The one that contains the largest percent- 

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 Read what Dr. J. B. Smith, state entomolo- 

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NOZZLE 



This illustrates the Spra- 



motor Nozzle, Fig. 56. 



designed to apply limo 



sulphur mixture. It is 



made in brass with brass or steel removable discs, 



or with aluminum cap and body, and brass or 



steel discs. The particular merit of this type of 



nozzle is in the large liquid ways that prevent 



clogging and the double ways being at an angle 



that gives the most perfect form of spray. 



We believe, for the purpose of spraying with 

 lime-sulphur, or any coarse materials under heavy 

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