Evening journal., 1907-02-21
REMEDIES FOR
SAN JOSE SCALE
State EntOmOlOgiSt Issues
Bulletin Of Great interest to
HOrtiCuIturiSts
SUGGESTS PROPER CURES

lege Experimental station has issued the
following bulletin on the San Jose Scale:
The best time OF year for spraying for
the san jose Scale will soon be here, and
persons intending 10 spray for this pest
must soon determine what they will usa.
The present article. while il contains
nothing Of Importance that has not al
ready been published in some Of our regu-
lar station bulletins. is offered in the hope
that it may prove Of interest and value to
those fruit growers who have not yet de-
c.ded what materials they will use in their
spraying operations this year
The Insecticides for the San Jose Scale
now in general use in Delaware may be
grouped, under three headings. viz: The
Lime-sulphur Wash: the so-cailed "solu-
hle Oils" (better termed Aiiscible oiis),
and Kerosene Emnlsions.
The Time Sulphur Wash.
"Entomologists throughout the country
seem TO be pretty well agreed that there
Is no better or cheaper insectcide for the
san Jose Scale, all things being considered
than the lime-sulphur wash. The main
objection to its use is found in the fact
that it requires some time for propara-
ton and that ii is disagreeable to apply,
owing TO its caustic properties. However.
the fact that those men who use the most
of It appear to have the least fault %
find. would seem 10 Indicate that these
objections can be largely overcome by an
intelligent handling Of the material.
Various formulas for the preparation
-. g.. 81 81.
country have boen published, but nearly
ali OF them have given uniformly good re-
suits. The formula which the writer is
at present recommending is as follows:
Lime, 30 pounds; sulphur % pounds,
salt, 10 pounds water 50 gallons
"nhe lime. sulphur and salt should be
boiled together In at least % gallons OF
water for a period Of 3O-i5 minutes; the
rest of the water may then be added and
the material is ready for application. The
boiling may be done either by steam or
over a fire. If done in the latter way,
only iron kettles should be used, as cop
per or brass .receptacles or galvanized
iron vats are easily oorrodcd by the wash.
TN applying this material much dlscom-
fort may be avoided by wearing rubber
gloves and smearing the face with vase
line
THE lime-sulphur wash may be applied
late in the fall. IN the winter or early In
the spring. II is best applied shortly be-
fore the buds open. 1t cannot be used upon
trees in foliage
The Miseible Oils.
There are three proprietary insecticides
upon the market, which have been used
quite extensively in Delaware tho past
season. They arc commonly known as
/ Soluble Oils. and sold under the trade
names Scalecide. Blil-o-Soale and Target
Brand Scale Destroyer.
"The manufacturers of these insect'c.d- Z
ordinarily recommend their use az tns
rate Of one part to twenty parts Of water
and the writer has. in some instances, hae
satisfactory results from their use at thii
rate. However il would now seem advis
able, in view Of some personal exper' once
and the reported experinces Of o hers t,
recommend their use al the rate of on'
part TO not more than fifteen parts Of
water.
The miscible oils are easy to handle
since they mix readily with cold water
and there is nothing In the spray mixtur,
70 clog the nozzies or corrode tho pumps
Another point in Their favor Is that thes
are not caustio Ike tho Lime sulphur wash
and there Is ordinarily but little d'scom
fort in their application. Their cost. how.
ever. is considerably greater than that oil
the lime-sulphur wash, and their value a,
fungioides has not yet been satisfactoril,
proven.
In using these oils. one point shoult
always be borne In mind; the contents
Of the original package be it small oi
large should be thoroughly agi'a'ei be
fore any portion is mixed with water fol
spraying. Tho reason for this is that 1t
some cases there appears to be a separa.
ton Of the oils upon standing. the res~lt
being that at tho top Of the recep. acl,
l a material may be found quite din ren
/ from that at the bottom. Some serious in.
jury to trees. in this State, has bren at
tributed to failure to observe this import
ant point.
Kerosene Emulsion.