The Hood River glacier. (Hood River, Or.) 1889-1933, 1916-06-08
COOLING MOTH SPRAY
RECOMMEND

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(By Leroy Childs. Hood River Ex-
pertinent Station)
The continued cool weather Of the
past month has greatly retarded the
development of codling moth, fac
tor which has materially delayed the
application of the 30-day, or second
codling moth spray. In view of the
fact that there occurred during the
past year an over-abundance Of cod
ling moths, the use of arsenate Of
lead should not be omitted in any Or
chard in the valley, that we may not
have a duplication of infestation that
occurred last year. Many moths
over.wintered in the orchards and it
will only be a case of thorough, we'll
timed spraying for this pest that We
have clean fruit at harvest.
The many factors that present
themselves at this time makes the re-
commendation of general scab
spray very problematical. The in
vestigations carried on by the expert
ment station have not been extended
over a sufficient period Of years, COW
ering seasonal variations, to warrant
the use of a fungicide with absolute
safety, yet we know that with rainy,
damp weather occurring the present
leaf infestation will give rise to fruit
infestation unless fungicide of
some sort is used in the next spray.
1t is the recommendation of the ex-
pertinent station that each grower
carefully analyse his individual case
and choose from one Of the follow
ing suggestions as to the method of
procedure he should follow.
The present development of the
codling moth indicates that the lead
should all be on the trees by the goth
of June. This is very late to use
lime-sulphur with safety, unless cool
weather prevails or burning of
fruit may result.
The following suggestions are Of
fered to suit the different orchard
conditions:
A-Orchard practically free from
fruit and foliage infection by the 10th
of June:
/: Use atomic sulphur 10 pounds
to 100 gallons, If the material has
been used in one of the earlier
sprays. Add arsenate of lead
Q: Weather cool (not over 80 in
the shade) use lime-sulphur one to
As. Do not drench the trees. Add
arsenate of lead.
8: Weather apparently settled and
not on or after the 10th of June.
Use only arsenate of lead.
B. Orchard showing considerable
fruit and foliage infestation by the
10th of June.
1: Use atomic sulphur IL to 100,
If this material was used in one of
the earlier sprays. Add arsenate
of lead.
2: Or use lime-sulphur one to 40.
Add arsenate of lead.
On account of the high price of
blue stone the use of this material is
almost out of the question. It can
only be used with safety after the
'fuzz" has left the apple. A condi.
tion which is not the case this year
on account of the lateness of the
season.
In orchards showing considerable
fungus at the present time it will
hardly be safe to omit the fungicide
even though some burning results
In three years of experimental work
carried on in Hood River the great.
est loss that has occurred in our
lime-sulphur experiments has not ex.
ceeded 10 per cent. However, this
season is ten to fifteen days later
than we have had to deal with in the
past. A factor which might slightly
increase the injury. Avoid drench
ing the trees with spray at this time
and do not apply anything, even the
arsenate of lead alone, If the weather
is extremely hot; that is, during the
middle of the day.
| The uncertainties that we have tc
deal with in this last spray clearly
indicates the value of accumulative
data gathered over period of years
to meet the varying conditions and
the necessity of stability in carrying
on such work.