The Spraying or Orchards. 5i97 



watery solution of the iodide of potassium was used for dissolving the 

 iodine crystals, and this solution was so diluted with water that it 

 resembled weak black tea in color. The proportions used were : 



Iodine solution, 1 pint. 

 Water 2 gallons. 



All the plants to which this solution was applied were injured by it, 

 the quinces probably more than any of the others. Fully 25 per cent, 

 of the quince leaves were burned. This injury to the foliage obscured 

 the fungicidal action of the iodine; and although it was thought that 

 some advantage had been gained from its use upon dewberries and 

 quinces, still further trial is necessary to determine its value in this 

 respect. 



The application of dissolved iodine crystals is unsafe and it is of 

 doubtful value. 



iVo. 10. — Nitrate of soda. — This substance was suggested by Joseph 

 Harris. It was applied in solution. 



Soda nitrate, 2 ounces. 

 Water, 2 gallons. 



Applications were made to the same plants rnentioned under No. 7, 

 but the variety of apple here used was the Baldwin. ' All the plants 

 were injured. Fully 20 per cent of the Baldwin leaves were affected, 

 and 10 per cent of the quince foliage. The other plants suffered but 

 slightly. No reduction in the amount of fungous injury could be 

 noticed followiflg these applications. 



Nitrate of soda when applied in water has a caustic action upon 

 foliage and possesses apparently no fungicidal properties. 



iV(?. 11. — Caustic potash. — During the month of May, 1892, Mr. 

 W. C. Archibald of Wolfsville, Nova Scotia, sprayed a large number 

 of apple, peach and plum trees with a solution of " rock or caustic 

 potash, diluted to about the proportion of 1 pound to 2 gallons of 

 water." The buds on the trees had not yet burst although they were 

 swollen. Regarding the result, Mr. Archibald writes: " \^y accurate 

 observation my plums and apples, where the potash was so used on the 

 buds, are pronounced one-eighth larger than those borne in previous 

 years." 



As tested at this station during the past season, caustic potash was 

 used in the form of sticks obtained from " a druggist. It was used as 



follows : 



Caustic potash, ^ ounce. 



Water, 2 gallons. 



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