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The Pamphlet Collection of Sir Robert Stout: Volume 62

Bordeaux Mixture

Bordeaux Mixture.

This now-celebrated fungicide has proved of immense value to vine-growers all over the world. It is impossible to estimate the saving it has effected. It stands in its modified form the cheapest page 12 as well as the best remedy for all fungus enemies of fruit-trees or vines which can be reached by spraying.

It is generally used in conjunction with the following fungicide : ammonio-carbonate of copper. The former is used early in the season, and the latter for the sprayings as the fruit approaches maturity, as the Bordeaux mixture has a tendency to stain it at that time. The following are the common names of the diseases for which the above-mentioned washes are of greatest value: Mildew, scab, and bitter-rot of the apple; scab, cracking, and leaf-blight of the pear; shot-hole fungus of apricot and peach; curl and rust (miscalled yellows) of the peach; rust and shot-hole fungus of the plum; oïdium or mildew and black-spot of the grape.

The Bordeaux mixture has been greatly modified of late, as recent experiments have proved that a much weaker solution than what was formerly in use gave practically as good results as the old formula. Ingredients:—
Sulphate of copper (bluestone) 2lb.
Quicklime 2lb.
Water 30gals.

It must be noted that these washes having copper as a base must not come in contact with iron, as then the copper would be deposited on the iron, and the wash spoiled. Dissolve the 2lb. sulphate of copper in 4 gals, hot water in a wooden vessel. Slack the lime in a gallon of water; pour this slowly through a strainer into the copper-sulphate solution; finally add the remaining 25 gals, water, stir thoroughly, and the mixture is ready for use.