Tensas gazette. [volume] (St. Joseph, La.) 1886-current, 1908-08-28

'conducted in the same manner.
The powdered arsenate of lead
was applied to the cotton OH April
~ and a cage placed over It at
once, and another cage over the
cotton to which no poison had
been applied. In each cage TWEEN
ty-eight admit boil weevils were
placed. The examinations made
on succeeding days gave results
as follows:
On April %, one day after
poisoning, all weevils in both
cages were still alive.
On April 20, two days after
poisoning, there were 10 weevils
dead and Is alive in the poisoned
cage, and 1 dead, 1 missing and
20 alive in the check cage.
On April 30, three days after
poisoning, there were is weevils
dead and II alive in the poisoned
cage; 2 dead, 1 missing and %
talive in the check cage.
On May l, four days after pois-
oning, there were 20 weevils dead
and 8 alive in the poisoned cage;
2 dead, l missing aud % alive in
the check cage.
On May 2, five days after pois-
oning, there were % weevils dead
and 8 alive in the poisoned cage;
II dead, 2 missing and "a alive in
the check cage.
On May 4, seven days after
poisoning, there were 26 weevils
dead and 2 alive in the poisoned
cage; A dead, 2 missing and %
alive in the check cage.
On May 5, eight days after
poisoning, there were 81 weevils
dead and l alive in the poisoned
cage; 4 dead, missing and %
alive in the check cage.
On May Z, ten days after pois-
oning, there were % weevils dead
in the poisoned cage; 5 dead, 5
missing aud Is alive in the check
cage.
In experiments of this kind it
is not always possible to find all
dead weevils, some of them being
carried away by ants, beetles,
etc. However, it is very proba BILE
that all the weevils which were
missing were III reality dead, and
for the purposes of the expert
ment they were so considered.
The powdered arsenate of lead
has many advantages over Paris
green. In the first place, it is
practically free from soluble ar
senious oxide, the ingredient of
Paris green which causes injury
to plant life, and applications of
the powered arsenate III midsum-
mer are not likely to check the
growth of the cotton plants i'm
the way that Paris green fire.
quently does. When properly
made, the powdered arsenate of
lead is an impalpable powder
which can be busted from sacks
as readily as dry Paris green.
Every cotton planter knows that
the first heavy rain following an
application of Paris green will
wash practically every vestige of
it from the plants. If the pow
dered arsenate of lead can be APP
piled to the plants. When there
is a dew upon them, or if a heavy
dew falls during the night follow
ing the application, the arsenate
becomes firmly fixed, and there
after it will require rain after
rain to wash it off. Finally, it'll
is anticipated that the powdered |
arsenate of lead, when placed |
upon the market by chemical
manufacturers, will be available |
at a price considerably lower than
that paid by the planters for
Paris green at the present time. |
This Office has heretofore rec
commended that light applica-
ton of Paris green be made to
the cotton field during the first
week in August for the purpose
of killing the just-hatched larvae
of the boil worm fnot boil Vice.
VIII Hereafter we shall recon-
mend that powdered arsenate of |
lead, instead of Paris green, be |
used for the purpose also.