The Grit-advocate., 1903-10-23
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Bordeaux Mixture.

Bordeaux mixture is OF very great
matter OF its compounding has been
frequently discussed in these col
umns. Prof. J. T. Stinson, writing on
this subject, says: This preparation
is now made either as a liquid mix
tuTe or as dry powder or dust. Bor-
deaux mixture (the liquid) has for
years been the standard and most eff
ficient fungicide for general all-pur-
pose work that has ever come into
use. 1t has also been the subject of
much discussion at the several ex-
pertinent stations as to what is the
proper strength to use to obtain the
best results, and as to its effect on
the fruit and foliage So far as the
amount OF material to use is con-
cerned, it is quite probable that the
quality Especially of lime) and the
proportions Of the materials is OF
much more importance than the
amount Four pounds of lime is con-
s1dered sufficient to neutralize six
pounds Of blue stone; but it does not
seem necessary to utilize six pounds
OF this substance. AS good results
have been obtained from the use of
TOUR pounds as from using six. In
fact the a. formula seems to give, II
possible, even better results than the
6-4- on account of the liability to in
jury from the use of the strong mix
ture. Four pounds of good lime fur
n1shes sufficient excess over what is
actually needed to neutralize the four
pounds OF blue stone to insure against
injury in all ordinary cases, and the
use of any more would seem unneces-
sary, even were it only for the sake Of
being on the safe side The object
OF the lime is to neutralize the blue
stone, to hold 1t on the plant and to
prevent the toe, rapid solution of the
copper by atmospheric agencies. Ac-
cordingly the formula given is prob
ably the most satisfactory for this
section of the country. 1t is one that
Is in general use throughout the CEN
tral west and is recommended by the
experiment stations in Ohio, Iowa,
Illinois, Missouri and other western
states:
Good stone lime Unjust not
be air slacked). ........ pounds
Copper sulphate (blue
stone) .................. pounds
water So gallons
Directions for Making-Slack the
four pounds of lime in one barrel or
ia ak, using just enough water to pre-
vent burning, then dilute to twenty
five gallons. Dissolve the four pounds
OF blue stone in another barrel or
tank, using twenty-five gallons of
water. Pour the two solutions into a
third tank or barrel by having two
men, one to dip from each and pour
together at the same time through a
sieve or coarse gunny sack into the
third tank, keeping the contents of
all the receptables well stirred dur
ing the making. Do not pour one
solution into the other. for a much
better mixture will be obtained If the
above directions are followed. The
reason for urging that the mixture be
made in this way are as follows: The
particles of copper, which is the act
i've principle of the mixture, are in a
much more finely divided condition,
and for this reason the same amount
of copper Is distributed more evenly
over a greater surface, thus making
it more efficient. The mixture does
not settle nearly SO rapidly because Of
the small size of the flakes of the cop
per- The violent and more incom-
plete chemical action that takes place
when the lime and blue stone are put
together in concentrated condition is
avoided, and mixture is obtained
that is much less likely to do injury.