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Wisconsin State Horticultural Society / Annual report of the Wisconsin State Horticultural Society for the year 1910
Volume XL, Part II (1910)

Richards, M. W.
How to make Bordeaux mixture,   pp. 150-153 PDF (937.1 KB)


Page 151


WINTER MEANG.
sideration is the materials. It is made of Copper Sulphate com-
monly called blue-stone or blue vitrol, stone lime and water.
To make a satisfactory mixture the best materials it is possible
to obtain should be used. Copper Sulphate often contains small
percentages of iron sulphate but rarely in excess, or in sufficient
quantities to interfere with the efficiency of the Copper Sulphate.
If first class sulphate is bought very little difficulty will be ex-
perienced as far as it is concerned. The lime, however, often
offers serious difficulties. Lime contains mere or less impurities.
If the percentage of calcium oxide is high the lime is technically
known as a "fat" lime; this on addition of water, slacks quickly
and completely and will perform its office in the compounding of
Bordeaux Mixture in a satisfactory manner. If on the other
hand the lime contains a large percentage of magnesia, clay or
sand, it is known as "poor" lime. Such limes slack slowly and
incompletely and do not make satisfactory Bordeaux.
Air slaked lime should never be used as mixtures made with
such lime are not only extremely injurious to foliage but are
less adhesive and do not remain in suspension as long as mix-
tures made with fresh stone lime. The water used in prepar-
ing the mixture has very little to do with the efficiency of the
Bordeaux. In spraying large commercial orchards large quan-
tities of water are necessary and it is essential that the supply be
ample and conveniently located.
For the commercial orchard, wholesale quantities will be
needed and the local drug store should not always be depended
upon to supply the demand. Buy your materials from some.
reliable dealer and in quantities large enough to take advantage
of wholesale prices.
The cost of materials will depend largely on the amounts
bought, and the grade.
The amounts needed will depend upon the size of the orchard,
age of trees, number of times the trees are to be sprayed, and
the season at which they are sprayed. On the average, one bar-
rel (50 gal.) will cover twenty, 20 yr. old trees. At the pres-
ent prices-8c per lb. for Copper Sulphate and lc per lb. for
lime, 50 gal. Bordeaux Mixture will cost about 36c or 1.8 cents
per tree. A 10 acre orchard with 104 trees per acre will re-
quire 50 to 60 bbls. or from 200 to 250 lbs. Copper Sulphate
and the same amount of lime for one spraying. These figures
cannot be made absolute because they are based on estimates
151


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