The county record. [volume] (Kingstree, S.C.) 1885-1975, 1922-08-17

will probably be found in serious num-
bers all over the cotton belt within
the next two or three weeks, and a
tremendous acreage will still be sus-
ceptible to serious damage at that
time.
Poisons to Use for Worm Control.
The leaf worm is very susceptible
to control by the use of ARSENAL pois-
ons, but the unfortunate feature of
the situation is the fact that the un-
precedented dcmand Tor calcium arse
nate for controlling the boil weevil
this year has not only consumed the
stocks of chemicals which can be
used for leaf worm control, and find
an alarming shortage. Considering
every chemical which can be used,
there is probably not to exceed three
million pounds avc:lable, and this
will be far short of the amount need
ed if the present indicated infesta-
tion develops. A comparatively small
amount of this material is available
in the south now, but manufacturers
have been notified Of the emergency
and the majority of stocks are al
ready rolling soutpward.
In the early days Paris green was
first adopted as a means of leaf worm
control. This gave very satisfactory
control, but always produced more or
less burning of the cotton plant, which
was undesirable though not nearly
as serious as the leaf worm damage.
Later, when powdered lead arsenate
was developed, it was very largely
adopted for the same purpose with
very satisfactory results. 1t did not
burn the cotton plants in the slight
est and stuck to the plants better
than Paris green, but unfortunately
was not as poisonous to the worms.
In the past few years calcium arse
nate has been used very extensively
for worm control, with very satisfac-
tory results. 1t is not injurious to
the cotton plant and is very nearly
as poisonous to the worms as Paris
green and much more so than lead
arsenate, In addition, however, there
are a large variety of other arsenicals
which can be used for leaf worm con-
troll with satisfactory results. These
include such as zinc arsenate, mag
nesium arsenate, London purple and
numerous other trade mixtures of
arsenicals. In view of the present
shortage, it is going to be necessary
and advisable for the farmer to take
practically any one of these which
can be secured, and any of them will
accomplish satisfactory leaf worm
control. The only arsenicals which
should be avoided are the highly
soluble ones, such as sodium and pot
assium arsenate. and arsenite, which
are very injurious to the plants. The
following outline covers the manner
in which these materials should be
used:
Calcium arsenate should be applied
at the rate of about three or four
pounds per acre, either straight or
diluted with one part of lime.
Lead arsenate should be applied
without dilution at the rate of four
to five pounds per acre.
Paris green should always be mix
ed in the following proportions: l
part Paris green, l part flour, and
from 1 to 5 parts of lime. The flour
will make the mixture stick to the
plant and the lime will reduce the
chance of plant injury. The mixture
should be used at such a rate that
about two pounds of Paris green per
acre will be applied.
London purple should be used in
the same manner as Paris green.
Magnesium arsenate should be used
straight or mixed with l part of lime,
at the rate of about 5 pounds of
poison per acre.
Zinc arsenate should be used with