| Material Information
||Directions for preparation of Bordeaux mixture
||Press bulletin 1 ; Florida Experiment Station
||4 p. : ; 21 cm.
||Hume, H. Harold ( Hardrada Harold ), 1875-1965
University of Florida -- Agricultural Experiment Station
||Florida Experiment Station
||Place of Publication:
||February 1, 1901
||Bordeaux mixture ( lcsh )
Fungicides -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||H. Harold Hume.
||"Feb. 1, 1901."
||At head of title: Department of Horticulture and Botany.
| Record Information
||University of Florida
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 83277051
Press Bulletin No. i.
Feb. i, 191o.
Florida Experiment Station.
HORTIGULTURE AND BOTANY.
Directions for Preparation of Bordeaux Mixture.
Many preparations have been recommended and ap-
plied for the control of fungus diseases, but years of ex-
perience have proved that ease of preparation, ease of ap-
plication, efficiency, cheapness, and all other things con-
sidered, Bordeaux mixture has more to recommend it as
a fungicide than any other application. In point of effi-
ciency it is equaled by none, though it should be borne in
mind that for certain purposes sulphide of potassium,
ammoniacal solution of copper carbonate and sulphur
have much to commend them.
Our truckers and fruit-growers have not generally
looked upon Bordeaux mixture with the favor that it so well
deserves because of the fact that rock lime, so essential for
its preparation, slacks very quickly in our moist climate.
Not knowing that lime can be preserved almost indefi-
nitely, they are compelled to order in small lots and fre-
quently have not the material at hand when required for
Gost of Materials.
The cost of substances entering into the composition
of Bordeaux mixture is of course subject to the same
fluctuations in value as are other commercial commodi-
ties, but the following prices may be taken as being nearly
Copper sulphate 5 to 7c per pound; quick lime, 85
cents to $1 a barrel.
Copper Sulphate-.............6 pounds.
Quick lime-..-....-- ....-----.4 "
Water .--..-...- ..-- ..--..-.45-50 gallons.
These amounts are for the large barrel spray pumps.
The knap-sack.spray pump generally holds about four or
five gallons. To make enough of the mixture to fill the
chamber, there will be required approximately:
Copper sulphate-..--.......------ ounces.
Quick lime-..--..............6- "
Water ......................4-5 gallons.
Stock Solutions and Preservation of Lime.
To preserve lime, empty the barrel of lime as soon as
received into a kerosene barrel and add enough water to
slack and reduce the lime to the consistency of putty.
Keep the lime in the barrel covered with two or three
inches of water and keep the barrel covered with boards
to prevent evaporation. ALWAYS KEEP THE LIME COVERED
S If much spraying is to be done, it is always prefer-
able to make stock solutions. This is done by measuring
out a definite quantity of water, say 25 gallons, into each
of two barrels. Into the first of these put 25 pounds of
copper sulphate (blue vitriol.) Into the second 25 gal-
lons put 25 pounds of lime paste mentioned above, or a
little more to make allowance for the water contained in
it. The copper sulphate should not be thrown into the
barrel as it will not then dissolve readily, but it should
be suspended under the water in a coarse sack hung from
a stick laid across the barrel. When thoroughly agitated
one gallon of Solution No. 1 will contain one pound of
copper sulphate, and one gallon of Solution No. 2 will
contain approximately one pound of lime.
Now, if a barrel spray pump is to be used, dip out 6
gallons from solution number one and place it in the
barrel of the spray pump. Then fill the barrel nearly
half full of water; add four gallons of the lime solution
and pour in the remainder of the water.
Immediately after preparation THE MIXTURE SHOULD
RE TESTED to determine whether enough lime has been
added, for if sufficient has not been used to neutralize the
copper sulphate, the foliage of the plants may be burned.
The best test is the Ferrocynanide of Potassium test.
Procure from the druggist 4 ounce of Potassium Ferro-
cynanide; place it in a bottle and dissolve it in 4 pint of
water, or about half a cupful. As soon as the mixture is
prepared, dip out a few spoonfuls of the Bordeaux mixture
into a porcelain saucer. Into this drop two or three drops
of the Potassium Ferrocynanide solution. If A REDDISH
BROWN COLORATION is noted, more lime must be added to
the mixture. ADD AND TEST UNTIL NO COLORATION IS
NOTED. If at the first test no coloration follows, no more
lime need be added.
Points to be Observed.
Strain all solutions before placing them in the spray
pump. All vessels in which the solutions are kept should
be of GLASS 1r WOOD. All parts of the spray pump which
come in contact with the mixture should be made of
BRASS. Do not use Bordeax mixture after it is a day or so
old. If a large spray pump is used, the pump should
have an agitator attached, or it may be agitated by hand,
using the instrument like an old-fashion churn dash.
Spray as indicated by the health of the plants.
Destroy badly diseased plants or portions of plants. If it
rains immediately after spraying, no results need be
expected. A- second application must be made. BOR-
DEAUX MIXTURE IS NOT AN INSECTICIDE. It should never
be used against insects. If so desired, j pound of good
Paris green may be added to each barrel of the mixture
for the destruction of biting insects.
H. HAROLD HUME.