The Kennewick courier-reporter. [volume] (Kennewick, Wash.) 1914-1938, 1928-04-19
GIVE HINTS ON
MOTH CONTROL.
Experts make Suggestions
as to Methods Best
Suited to Situation

Meeting last week at the close
of the Wenatchee economic confer
ence on fruit, representatives of
the state college, federal bureau of
entomology and the state depart
ment Of agriculture prepared an
advisory list of recommendations
on spraying program for 1923 to
control codling moth.
E. G. johnson, dean of the col
lege of agriculture, Pullman; j. /.
Griner, state supervisor of horti-
culture, Olympia; G. E. Harter,
district horticultural inspector, We
natchee; E. j. Newcomer, associate
entomologist in charge of the fed
eral chronological laboratory. Yak
ina; F. c. Nelson, district horti-
cultural Inspector, Spokane; An
thony Spuler, associate entomol-
ogist, state agricultural expert
ment station, Pullman; r. L. Web
ster, entomologist, Pullman; DR..
J. r. Magnus, head state college
horticultural department, Pullman;
NJ. d. Armstrong, extension service
Pullman; Wendell Brown, district
horticultural inspector, Yakima,
were signers of the following rec
concentrations:
The severity Of codling moth in
festation in the state of Washing
ton depends on the temperatures
at the time of emergence of the
moth, length of growing season
and degree of infestation the pre-
yious year. From year to year,
such infestation varies in intensity
in different districts and in diff
ferent orchards and in different
portions of The same orchard.
There is no reason to believe that
the codling moth infestation is GO
ing to be less for 1928 than in
former years.
Within single district orchards
vary in exposure, density of tree
growth, type of cultivation (wheth-
er cover crop or clean culturel I,
and type of soil. All of these fac
torsmay affect the time of emerg-
ence and development of the cod
ling moth.
Because of these variable factors
specific spray recommendations
cannot be given for an entire state
or district. The spray program,
while based on general principles,
must be worked out in detail for
each individual orchard.
Extension experiment work for
the codling moth control was con-
Quoted in 1927 and will be contin-
ued in 1928. On the basis of this
and former work, as well as prac-
tical results in commercial or
chards, the following is recon-
mended as a guidance to the
grower for 1928. The general prin-
ciples are here outlined:
1. Arsenate of lead is the only
known practical and effective I'M
secticide that can be uncondition-
ally recommended for codling moth
control at this time. One pound of
arsenate of lead to so gallons ct
water is usually sufficient. Heav-
ier dosages are not recommended
because of consequent difficulties
of the residue removal.
2. Oil in combination with arse
nate of lead has proven effective
for codling moth control, but is not
recommended because Of the possi-
bility of injury to fruit and foliage.
Oil alone is not as effective as
either lead arsenate or the oil and
arsenate combined.
8. Nicotine sulphate and other
insecticides must be considered
either ineffective or in the exper-
imental stage. Do not use them
except for experimental purposes.
a. The time of application and
number of sprays to be used viii
vary in different orchards and in
different localities, and should be
determined by each individual
grower.
5. Major efforts for codling moth
control should be directed toward
first brood elimination.
6. The calyx spray should be ap
piled before the calyx lobes have
closed. Experiments show that this
spray is important and should not
be omitted.
4. The cover spray should be
timed carefully by the use of moth
traps placed well up in trees, away
from packing sheds or other build
ings. The first cover spray should
be completed within 10 to IL days
Confined on page four)