The Dolores star., 1924-07-11
ORCHARD
ELEANINES
SAN JOSE SCALE is
MOST SERIOUS PEST

In the minds Of the fruit grower
serious pests he has to deal with, and
during the past three or four years 1t
has been on the increase to such an
extent that 1t threatens to become a
serious menace to the fruit industry.
unless stringent measures are used to
combat it.
A conference for the study Of the
scale was held at Vincennes. composed
Of A. ]. Alderman. entOmologist of
Bentonvilie, Ark. B. A. Porter. ento-
mologist stationed at Vincennes; w. P.
Flint, entomologist from Illinois, and
]. J. Davis. entomologist Of the Pur-
due experiment station. From the
results Of past experiments 1t was
found that lime-sulphur failed to kill
a large per cent Of the scnle. Some
thing more effective has to be used.
The recommendation made at this
conference was that oil sprays be used
when the trees were in the dormant
state. The sprays found effective
were the miscible oils and boiled lu-
bricating oil emulsion. Various mis-
cible oils are advertised In the horti-
cultural publications. These must be
used at the strength recommended by
the manufacturers.
The boiled lubricating oil emulsion
Is made from the formula as recon-
mended by the United States Depart
ment Of Agriculture and is as follows:
Diamond parafin oil, l gallon; liquid
potash fish oil soap, l pound; water
| " gallon.
This constitutes the stock solution.
A spray solution containing from to
per cent of oil was recommended.
| depending upon the seriousness of the
| infection. A 2 per cent solution is
made by adding IL gallons of the
stock solution to 5O-gallon barrel Of
spray, and 3 per cent solution is
made by adding 2A gallons of the
stock emulsion.
Those interested in the details Of
making this stock emulsion should
write the Purdue experiment station,
| Lafayette. Ind. Those using only Il
small amount Of the emulsion during
the season, say three or four barrels.
| will probably find II to their advan-
| tage to purchase the material ready
prepared, due to the fact that It
| tHkes some special equipment to make
1t. 1t is necessary to pump this ma
terial with a force pump while 1t Is
very hot, which Is exceedingly hard
| on the pump unless 1t Is equipped
with metal valves and special pack
ing. Leather packing and valves burn
| out in very short time. Manufac-
| turers who make the material in large
lots can buy the raw material at de-
cided advantage.
OIL emulsion Is recommended only
| as an insecticide, and is not fungi
eide. 1t will not control peach leaf
| curl, and the usual fungicide has to
be applied for curl. Lime-sulphur Is
generally used for this and should be
| applied in advance of the oil spray. as
1t will penetrate the crevices better
than If applied after the oil.
This oil emulsion has several dis
tinct advantages over lime sulphur. 1t
has been proven more effective, 1t Is
more pleasant to use as 1t does not
injure the eyes or skin Of the opera
tor, 1t does not cOrrode the pump, but
makes 1t work perfectly, the cost Is
less than one-half that of lime-sul-
phur. The stock solution will last all
season if not allowed to freeze.
Fruit growers generally are very en-
thusiastic over this new spray. EN-
periments the past season Indicate
that this material can be used as
summer spray to kill aphis and hatch
ing scale.