REPORT OF THE HORTICULTURIST 113 



SESSIONAL PAPER No. 16 



used with the Burgundy mixture. It will, therefore, be readily seen that no arsenical 

 poison should be used with Burgundy mixture for fruit trees. 



In some potato experiments conducted during the past year we have not noticed 

 any injury to the vines from the use of Paris green with the Burgundy mixture, 

 although slight injury not detected, may have occurred. The formula for Soda 

 Bordeaux mixture was published in the report of the Horticulturist for 1902. The 

 following formula has been used with success for spraying potatoes for the prevention 

 of blight and rot, although the results were not quite as good as with ordinary Bor- 

 deaux. The details of the results will be found among the potato experiments in this 

 report. 



SODA BORDEAUX (BURGUNDY MIXTURE) FOR POTATO BLLIGHT AND ROT. 



Copper sulphate (bluestone) 6 lbs. 



Washing soda (carbonate of soda) 7i lbs. 



"Water (1 barrel) 40 gallons. 



Dissolve copper sulphate as for Bordeaux mixture. Dissolve washing soda in 

 about 4 gallons of water. Pour the copper sulphate solution into a barrel, half fill the 

 barrel with water, then stir in the solution of washing soda, and finally fill the barrel 

 with water. It is now ready for use. The Soda Bordeaux adheres better to the foliage 

 when freshly made than the ordinary Bordeaux mixture, but it deteriorates rapidly in 

 this respect and must be used as soon as made. If left to stand for twenty-four hours 

 it will have lost nearly all its adhesiveness. The Soda Bordeaux is not recommended 

 in preference to the ordinary Bordeaux mixture, but where lime cannot be obtained it 

 may be used with good results. Furthermore, on account of its freedom from gritty 

 matter, there is less likelihood of the nozzles becoming clogged when it is used. As 

 washing soda is considerably more expensive than lime, this mixture costs more than 

 the ordinary Bordeaux mixture. If Soda Bordeaux is used for fruit trees it should 

 be made in the proportion of copper sulphate, 4 lbs.; washing soda, 5 lbs., water (1 

 barrel), 40 gallons, but no arsenical poison should be used with it. 



NEW POEMULAS POE KEEOSENE EMULSION. 



Kerosene emulsion has for a number of years been one of the best remedies for 

 sucking insects, but as it is somewhat troublesome to make, efforts have been made 

 'from time to time to find some other way in which kerosene could be safely used as 

 an insecticide. As kerosene does not mix with water it is necessary to apply it in the 

 form of an emulsion in order that it may be well distributed, and thus not cause in- 

 jury to the tree. 



In 1904 Prof. Close, of the Delaware Experiment Station, discovered that lime 

 could be used instead of soap as an emulsifying agent. By mixing 1 lb. of limoid, or 

 slaked lime, with 1 quart of kerosene and then diluting with water to the percentage 

 desired and churning for five minutes by means of the liquid pumped through a 

 coarse nozzle, an emulsion was formed wliich kept the kerosene in suspension for 

 several weeks. He called this mixture the K-L Mixture, from the initial letters of 

 kerosene and limoid. Limoid is a very fine preparation of lime manufactured in the 

 United States and not obtainable in Canada. In order to learn if good lime, well 

 slaked would not answer the same purpose, several experiments were planned and car- 

 ried out in the chemical laboratory at the Central Experimental Parm in conjunction 

 with Mr. P. T. Shutt, Chemist. The following results were obtained: — 



1. Preshly slaked lime makes a smoother emulsion and one that stays in suspension 

 longer than one made with ordinary air slaked lime; the latter, however, furnishes a 

 satisfactory emulsion if it is not too much carbonated by long exposure to the air. 



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