The Barre daily times. (Barre, Vt.) 1897-1959, 1917-08-04
SPRAY FOR LEAF
SPOT OF TOMATOES
Resin Fish-0il Soap Added to Bordeaux
Mixture Promises a Method of
Control.

The addition of resin fish oil soap q
Bordeaux mixture promises TO contro
tomato leaf-spot, although Bordeaux
alone has not prevented losses.
Plant.disease specialists in the federal
department of agriculture describe the
eaf-spot disease as one which causes de.
foliation of the plants, greatly reduced
yields, and inferior fruit. Small eircu-
lar spots develop on the leaves and some
times on the stems. They first appear as
tiny dots, having a dark or water.soaked
appearance. Gradually they enlarge and
turn brown, and the leaves shrivel and
drop, beginning at the base of the plant.
Making the Solutions.
Bordeaux mixture is best prepared by
making stock solutions of the separate
ingredients. The copper sulphate should
be mixed in the proportions of a gallon
of water, preferably soft water, to a
pound of the sulphate crystals and there
should be five gallons of this stock for
each acre of tomatoes to be sprayed. The
crystals should be dissolved in the usual
way by suspending them in a burlap bag
which touches the surface of the water;
the solution should be well stirred.
The lime suspension or milk Of lime, is
also pound to gallon, but only three
fourths as many gallons are needed as of
the copper solution, Thus, il there are
20 gallons of the copper solution there
would be only Is of the lime milk. The
lime should be slaked gradually by pour
ing the water on in small quantities and
at intervals until all has crumbled, FL
nally larger quantities are added with
constant stirring until the volume is
If quicklime cannot be had
and hydrated lime is available use as
many pounds of the latter as of copper
sulphate, but do not increase the guam
tity of water. Air-slaked lime must not
be used.
The resin fish.oil soap suspension is
made with a pound of soap to gallon |
Of water. As with the lime, only three
fourths of the quantity of water is nee
essary. Hot water will hasten the dis
solving of the soap. To avoid the .forma
lion of troublesome Jumps the water
must be added slowly at first with con-
'tant stirring.
Preparing the Mixture.
For general commercial operations two
10 gallon barrels with outlets at the bot.
ON are placed on a raised platform so
heir outlets will be higher than the top
f the spray tank To make 100 gallons
MEASURE eight gallons of the copper sui
hate solution into one barrel and six
allons of the milk of lime into the 9th
r. Add to each enough water to make |
7 gallons, stirring the contents thor
ughly, and then let the two solutions (
I'm with equal rates into trough lead
~ to the spray tank. At the same I
inc add six gallons of the resin fish-oil q
pap solution very gradually and in a G
mall stream through the spray tank /
trainer along with the copper-lime mix
IRE. The copper sulphate and lime
Mould be mixed before the soap is added.
Notifications of the method may be :
sed for smaller quantities.
Applying the spray.
A traction sprayer such as that en-
Ioyed in the spraying of potatoes may
. used except where the vines are too
rye. There should be three nozzles for
lch row, one to spray downward and
yo on the sides spraying toward each
her. These lateral nozzles should be
c low and pointed slightly up to get
lie spray on the under side of the leaves.
borough spraying, repeated at from
wen to ten day intervals, is necessary
If the best results, and must be contin
ID through August. When the plants
e too large for traction sprayer in
e rows, roadways should be opened
ID the spraying continued with long
les of hose.
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