The Hood River glacier. (Hood River, Or.) 1889-1933, 1909-11-04
ME.SULPHUR USED
FOR APPLE SCAB

Editor ier:-Knowing that
many OF your readers are Interested
in the work the Oregon Experiment
Station is doing in the Hood River
Valley, submit the following for
their consider alton.
Two years with the Lime Sulphur
solution at the Station, having prov
ed it's value as flung gioide, especially
for the control of Apple Scab. Prot
A b. CordIey established demonstra-
tion sprayiD iDgs on COMMERCIAL scale
at Hood River, the orchard used tor
this purpose being "Altenhurst" Dr.
Stanton, prop.
The progress OF the work has been
mentioned in former issues OF this
paper and all we Can say now about
the result Of this seasons work is that
Lime Sulphur has again demonstrat.
ed its fungicidaI value by keeping
the foliage free from Hcab. 1he result
of the previous years work was given
in the Septemb Der issue OF the Better
FIuit and the Information will again
be available, together with the ie
suits of this seasons work, both at
Hood River and Corva Ills, in forth
coming bulletin.
The point to be emphasized now is
the excellent opportunity the apple
growers In Hood River Valley have
forL stamping out apple scab or at
least of bringing it under control
- Those familiar with the lite. history
OF the fungus causing apple scab know
that 1t passes the winter as a sapro-
phyte on the ,decaying apple leaves
and that hese. leaves are the source
of the spring. intestation. 1t is evi-
dent. then, that ii every scabby leaf
IS destroyed between now and spring,
there will be no soab next year.
..ssAtlhough climatic conditions this
year we're rather unatVOrable for the
development OF the fungus, observa-
tIons which have been made, indicate
that there are few orchards in the val
ley that do not contain the fungus
Oh the foliage. This 10 especially
true Il the Newtown. The writer has
been able to find but few NewtoWns
trees that do not bear infested leaves.
The stamping out or oontIo ol OF the
fungus can probably be best accom-.
piished by one of the following meth
ods.
The first aud rather costly method
Is that Of raking and burning the
leaves after they have fallen from
the trees. The second and probably
equally effective method Is to ptow
the leaves under as deeply as posi- BILE.
Either of the above methods will re-
quire the concerted action OF all the
growers and should he practiced sew
eral consecutive yssIs. AS such con-
Gerted action is not likely to prevail,
it will tail to the individual grower
to insure his crop by the proper use
of fungicides. This can be done most
effectively and oheaply by the use of
a fall application followed by one or
two spring applications as the leaves
are unfolding. If the spring be wet
and favorable for the development of
the fungus, more applications should
be given.
With the beginning OF the fall Iains,
the scab colonies that we're held more
or less in check by the dry summer
weather, again become active and
spread the infection among the
leaves. 1t is this fall infestatiOn that
serves largely to garry the fungus
through the winter.
The tall injection can be checked
by applying either Bordeaux or Lime
Sulphur as soon as the fruit is gather
ed. The Station has begun the de-
monstratiCn spraying for the coming
season by using Lime-Sulphur, dilut-
ing the 81 degrees Beanme stock solu
tion l to II. This will give a spray
testing about l.O4 sp. gr. and which
will not only control the soab but
will destroy all exposed Anthraccnose
spores and the San Jose Scale rs we'll.
1t should also have detrimental effect
upon the Green and Brown Aphis
and their eggs. The use of Lime-Sul-
phur for this purpose, however is still
somewhat in the nature OF an expert
ment and we hope to give more de-
Unite information next year.
Another point to be investigated
The coming year is the time the per-
tect stage OF the apple scab fungus
The date the spores are set
rec and become capable of infesting |
.he young apple leaves in spring pro-
Dably varies with the locality and
IeasOn, but II the date can be approx
mRtely determined for Hood River
ALLEY, 1t may serve to lessen the work
lecesasIy for soab control.
+. l.. Griffin,
sat. in Plant Pathology, Oregon