The National tribune., 1891-06-11
THE NATIONAL TRIBUNE WASHINGTON D. c. THURSDAY JUNE H. 1891

for the plum, which Is somewhat more sus-
ceptible 10 scalding than the apple. White
arsenic does little if any injury at the rate Of
one pound to 80 gallons of water As shown
by Mr.. Gillette, however, when allowed to re-
main for some time two weeks or morel in
water, the white arsenic acts with wonderful
energy, scalding when used at the rate Of one
pound 70 100 gallons from 10 to 90 per cent Of
the foliage; ths action Of the other arsenites
remains practically the same, with perhaps,
slight increase in the case Of London purple.
With the peach these pOisOns when applied
alone, even at the rate Of one pound 10 300 or
more gallons of water, are injurious in their
action causing the loss Of much Of the foliage.
By the addition of a li:tle lime to the mix
ture, London purple and Paris green may be
safely applied, at the rate Of one pound 10
l25 TO $50 gallons Of water, to the peach or the
teudcrest foliage, or in much greater strength
to strong foliage, such as that of the apple or
most shade trees
Whenever, therefore, the application is made
TO tender foliage or when the treating with
strong mixture is desirable, lime water, milky,
but not heavy enough to close the nozzle,
should be added at the rate Of about two gal
Ions to 100 gallons Of the poison.
Pure arsenic, however. should never be used
with lime, as the latter greatly increases its
action.
With the apple, In spraying for the coddlipE
hiOLAs ~ icdsb TWO applications hnOulu NC uihlo
the first on the falling Of the blossoms the
apples being about the size OF peas. and the
second week or 10 days later; but the poison
should never be applied after the fruit turns
down on the stem, on account Of the danger Of
the poison collecting and remaining permA-
nently in the stem cavity.
For the plum eurcuio on the plum, cherry.
peach, etc, two or three applications should be
made during the latter part Of May and the
first half Of June; in tho case Of most leaf
feeders, spray on the first indication Of their
presence.
CAUTION NECESSARY IN THE USE OF THESE
INsECTICIDEs
The relative susceptibility Of apple. plum.
and peach has just been indicated under the
head Of arsenical pOisOns, and these remarks
apply equally we'll 10 the use Of the kerosene
emulsionA In the case OF other plants thor
ough experiments are still necessary, and all
insecticides should be first used in compare
lively high dilution. In general, il may DO
said that tender, young foliage Is more sus-
ceptible and must DO carefully treated. Thin
leaved, pilOse plants are more readily injured,
while thick-leaved, glabrOus species are least
affected. Annual plants, such as cabbages and
other garden vegetables, are more susceptible
than perennials, but In the case of root crops,
such as beets turnips radishcs, and potatoes,
there is not the same need Of caution as to
damage to foliage. Damage TO foliage is not
shown at once, and in case Of rain following an
application, another application should not be
made for several days Fruit trees should not
be sprayed with arseniesl poison before tho
blossoms fall, on account Of the danger Of pol
soning honey bees.