224 MINNESOTA STATE HORTICULTURAL SOCIETY. 



The best way to dissolve the copper sulphate is in a cloth bag 

 suspended in the water. It should not come in contact with metal. 



For a combined insecticide and fungicide add three pounds 

 arsenate of lead paste, or IV2 pounds of the powdered arsenate of 

 lead, to each fifty gallons of Bordeaux mixture or diluted lime- 

 sulphur. 



Concentrated Lime Sulphur. This material can be made at 

 home, but it is much simpler to buy it on the market, though 

 in any case the material should be tested before used. The mate- 

 rial sent out by any of the most reliable firms if left uncovered 

 will change its composition more or less. To test one should have 

 what is called a Baume Specific Gravity Scale, or Hydrometer. 

 These can be purchased for $1 or $1.50 from any large drug com- 

 pany, such as Noyes Bros, and Cutler, St. Paul, or Bausch and 

 Lomb Optical Co., Rochester, N. Y. To get the right amount of 

 dilution, one must have a dilution table such as given in any 

 bulletin or book where lime sulphur is discussed. For instance, 

 if a Baume reading was thirty-two degrees, and you are going to 

 use a dormant spray, you would dilute one part of the liquid with 

 eight parts of water; if you are going to use a summer spray, 

 you would dilute one part of the lime sulphur with forty parts 

 of water. The following table will show the amount of dilution 

 to use with a reading anywhere from fourteen degrees to thirty- 

 five degrees : 



DILUTIONS FOR DORMANT AND SUMMER SPRAYING WITH LIME SULPHUR. 



Amount of dilution. 

 Reading on Hydrometer. Number of gallons of water to the gallon 



of lime sulphur. 

 For For 



Degrees Baume. San Jose Scale. Summer spraying 



Dormant. of apples. 



35 9 45 



34... 83/ 4 431/4 



33 8I/4 411/2 



32 8 40 



31 7i/ 2 373/ 4 



30 71/4 36V4 



29 63A 341/4 



28 6I/2 323/4 



27 6 31 



26 53/4 291/2 



25 51/4 273/4 



24 5 26 



23 41/2 241/4 



22 41/4 223/4 



21 33/4 2IV4 



20 31/2 193/4 



19 31/4 I8I/4 



18 3 17 



17 23/4 16 



16 2i/ 2 15 



15 21/4 14 



14 2 123/4 



