54 Report of State Board of Horticulture. 



When the trees are in leaf the following 4-4-50 formula 

 is used : 



Copper sulphate, 4 pounds ; 

 Quick lime, 4 pounds ; 

 Water, 50 gallons. 



A weaker formula known as the 3-6-50 formula, is some- 

 times used on plants of tender foliage. In Oregon the for- 

 mula has been successfully used on the peach foliage .for pre- 

 vention of fruit spot but it is without doubt safer to use the 

 self-boiled lime-sulphur. 



Copper sulphate, 3 pounds ; 

 Quick lime, 6 pounds ; 

 Water, 50 gallons. 



It is of great importance that Bordeaux be properly 

 made. The mixture must be made fresh each time it is used. 

 The ingredients may be stored in stock Solution indefmitely, 

 however. Always use wooden or earthen vessels in prepar- 

 ing Bordeaux or the Solution of blue stone. 



When large quantities of Bordeaux mixture are requirecl, 

 it is most convenient to have stock Solutions made up contain- 

 ing one pound per gallon of the respective ingredients, Take 

 a 50-gallon barrel of water and suspend near the top a coarse 

 sack containing 50 pounds of crystallized or granulated com- 

 mercial copper sulphate. It will dissolve in a few hours. It is 

 convenient to arrange this the night before the spraying is to 

 be done. In another barrel place 50 pounds of lime freshly 

 slaked. For this purpose choose clean stone lime of the best 

 quality. Slaking should be done carefully. Water should 

 be added a little at a time so that slaking will take place rap- 

 idly. The process should be watched carefully and the mixture 

 stirred constantly while the slaking is going on, adding water 

 as needed to prevent burning, as lime should never be allowed 

 to become dry while slaking or it will burn, nor should it 

 become entirely submerged with water. The mixing can be 

 conveniently done with a hoe. When thoroughly slaked make 

 up to 50 gallons with water. 



If small quantities only of stock Solution are needed any 

 quantity can be made in the above mentioned proportions. If 

 the spray is to be applied to peach trees in foliage use the 

 3-6-50 formula. 



These stock Solutions can be kept for an indefinite time if 

 water is added to replace that lost by evaporation. They 

 should be kept covered to prevent dilution by rains. Made up 



