How To Make Bordeaux

Categories: Pests and Diseases of Plants

Use copper sulphate (bluestone) 5 pounds; quick-lime (good stone lime),

6 pounds; water, 50 gallons. Put the bluestone in a sack and hang it so

it will be suspended just under the surface of a barrel of water over

night, or dissolve in hot water. Use one gallon of water to one pound of

bluestone. Slake the lime in a separate barrel, using just enough water

to make a smooth, clean, thin whitewash. Stir this vigorously. Use

wooden vessels only. Fill the spray tank half full of water, add one

gallon of bluestone solution for each pound required, then strain in the

lime and the remainder of the water and stir thoroughly. The formula may

be varied according to conditions, using from 3 to 8 pounds of bluestone

to 50 gallons of water and an equal or slight excess of lime. Use the

stronger mixture in rainy weather. Keep the mixture constantly agitated

while applying.