Charlevoix county herald., 1914-05-16
POISONS USED IN
SPRAYING
Arsenate of Lime.
Division of Horticulture
Michigan Agricu huraI College

This poison is used very extern
sively. 1t can be secured for reason
able price, is ready to use at any
time, does not easily injdre the fol-
iage and is the only poison that CO..
be safely used in the lime-sulphurA
sprays. :
Injury to tender foliage like the
peach has occasionally occurred by
spraying with arsenate of lead and
water when the foliage was moist
from dew or rain. If necessary to
spray tender foliage (peaches or jan
anese plums) at such time it would
be we'll to add 8 to pounds of slaked
lime to every so gallons of the spray
ing material.
Arsenate of lead is usually sold in
kegs or exits" or small barrels in the
form of a paste. Some companies
have it in a powdered form. This
form usually costs twice as much or
more per pound as the paste form and
since it does not contain much water
only one-half the amount in wet
should be used as is recommended for
the paste form.
A simple, easy way to work the
thick pasty arsenate of lead into
thin, smooth paste las it should be
before using either alone or in some
thing) is to put the amount required
in key; add water and churn with a
dasher. This is much quicker than to
use a paddle.
Paris Green and Lime.
Always use lime with paris green,
it makes the poison stick better, be-
sides greatly reducing the danger of
burning the foliage.
For spraying from a barrel the
writer has found the following method
very useful: Place from one-quarter
to one-half pound of good lump lime,
or unslaked lime, in each Of three or
four tin pals which will hold about
three quarts or less. Old cans or
crooks will answer just as well. Add
enough hot water to Stake it into a
thin cream or paste. Now add to each
lot, one-quarter pound Of Paris green,
previously weighed out, and placed in
paper bags, stir while the lime is hot
and allow to stand for some time.
Now measure out about forty-four
gallons of water in your spraying
| barrel, and make a mark that will
show how high it comes in the barrel,
add the contents of one tin pail wiz,
one quarter of pound of Paris green
and one-half pound of quick-lime
slaked) into the forty-four gallons Of
water in the barrel Stir we'll ana
spray. The pals or crooks can be
used one at a time and refilled occa-
| sionally so that the stock is always
on hand ready for use
Arsenic of SOda-Kedzie Formula.
This form of poison was originated
at this Station by the late DR.. r. c.
Kedzie.
This is a cheap, effective poison
that can be prepared at home. 1t is
used by many of the grape growers
of Michigan in combination with the
bordeaux mixture. 1t cannot he used
in the lime-sulphur sprays. If used
alone-as is sometimes done for po-
tato bugs-slaked lime must be added
or the foliage will be burned.
The formula is:
! White arsenic ............2 pounds
Sal Soda Commonly called
washing soda) ..........8 pounds
Water. ............... gallons
Boil these materials in any iron pot
or kettle not used for other purposes
for about Is minutes or until the ar
senic dissolves, leaving only small
muddy sediment. Put this solution
into a jug or other vessel that can
be closed tightly and labeled poison"
| One quart of this solution is equal
to one-half pounds of Paris green.
For most spraying one quart in so
gallons of water with some lime) Or
bordeaux mixture will be sufficiently