The Kennewick courier-reporter. [volume] (Kennewick, Wash.) 1914-1938, 1930-07-03
THE KENNEwIcK coURIER-REPoRTER

ing the extent of the canker be-
cause of the solution is very pene-
trating and will kill large spot
of bark to the wood wherever a
wound has been made. e-~
All twigs and spurs within the
cankered spot, and for 5 to 6 inches
beyond, must be cut back to stubs
about 2 inches long. If the twigs
are cut off short, the solution will
kill a large spot of the cambium
LAYER around the cut. Be careful
to apply the solution well beyond
the last stub, for the pruning
shears may have infected the cuts
with blight even though the disease
had not progressed that far. All
except the cut ends of the stubs
must be covered with the solution.
Leaves remaining on the stubs
should be removed for they inter-
fere with the proper application
of the solution. 1t is not safe to
leave twigs and spurs in the treat
ed area, because blight may have
already progressed into them, even
tho they may appear healthy.
In case the disease extends down
twig and comes within 8 inches
of the larger branch, cut off the
twig and apply zinc chloride to the
larger branch.
Scales of bark should not be re-
moved i'm order to treat scaly-
barked trees unless these are al
ready loose and ready to fall away
naturally. On the underside of a
horizontal branch it is sometimes
necessary to remove the scales in
order to apply the solution. Scrap
ing or cutting off old bark and
scales, unless very carefully done,
causes wounds into which zinc
chloride penetrates and kills spots
of the bark and cambium layer.
Rough, scaly and corky bark should
be very thoroly saturated with the
solution. ..-.., e
Whether to use the 1870 solution
or the $3.50 solution is a matter
which the grower apparently must
experiment a little with himself.
In general branches / ga inches
in diameter and smaller should be
treated with the 1870 solution and
those larger with the $3.50 solu-
ton. There are times, however,
when branches up to 2 Ia to 2 IL
inches wide should be treated with
the 1870 solution, but when in
doubt, they recommend to treat
with the stronger solution as it is
better to kill the branches than to
allow the disease to live. Rapidly
growing trees and especially young
trees will absorb the solutions
more rapidly than older trees and
this may be used as a guide. Treat
ment of cankers on branches as di-
rected above will often enable the
branch to carry fruit to maturity
even tho the branch may die even
tually.
Formulas
Formula No. 1870 zinc chlor-
ide. Both strengths are prepared
by disolving dry zinc chloride pow
der in the following solvent in an
enameled kettle.
Solvent:
1 gallon denatured alcohol.
/ pint water.
8 ounces concentrated hydro
chloric acid.
Dissolve 6 pounds of zinc chlor-
ide in the above quantity % pts.)
of solvent In disSn1uiner fha Sol,,-
ton becomes very hot. Stir thoro-
ly, while hot, and crush all hard
Jumps with wooden paddle, until
thoroly dissolved. Avoid as much
as possible inhaling fumes, for the
chemicals used in denaturing the
alcohol are injurious. Cool as rap
idly as possible, covering with a
lid to prevent evaporation. Add a
few drops of laundry blueing to
give it a blush color.
Keep in large bottles, well cork