East Oregonian : E.O. (Pendleton, OR) 1888-current, 1905-04-21
FIGHTING THE MOTH.
REPORT FROM PULLMAN
COLLEGE ON PESTS.
Goblin Moth Most Destructive Apple
Pest Known-Two BroOds Per Year
Are Observation-Disclosures Agricul-
tural College Has Issued Bulletin
of Information of the Subject.

Following is condensed prelimin-
AIRY report on the Goblin moth in the
Yakima valley, as given by Eldred
Jenne in Bulletin 60 of the experiment
station at Pullman, Wash.
In making careful study of the
life history of the moth it was found
at least two generations of "broods'
occur each season. The first brood
of larvae entered during the month of
June, then a break occurred from the
last Of June to about July 20; then be-
tween July 20 and the last of August
the greater part of the second brood
of worms entered the apples. From
the last of August to the first of Octo-
Der there was a line of stragglers en-
tering the apples. These may have
been partial third broods and partly
late members of the second brood de-
layed by the lower temperature of the
fall
Now, about spraying. If the moth
seasons were the same every year,
the problem of spraying at the right
time would be a simple one. How
ever the time when the first worms
will enter the apples may always be
reckoned from the date of blooming
of the apple trees, the first worms en-
tering in three weeks or a little less,
after the blossoms fall. Then. If the
orchard was sprayed while the calyx
cups were open, the second spraying
should be about two weeks later in
two sprayings should suffice for the
first brood.
In the season of 1903 the sprayings
were made as follows; The first one
was made the middle of May; second,
the first of June for first brood; third
July 20; fourth, about August 7, for
second brood; and fifth. September 1
for third brood.
Orchardists must depend on theil
own observations and judgment fol
the time to spray for the second brood
as the conditions of the weather may
much modify the time of the appear.
ance of the second brood. 1t is or
account of this uncertainty that many
orchardists prefer to spray at regular
intervals throughout the season rather
than take the chances of leaving ou
a spraying at the wrong time. Som
spray from every two to four weeks
giving in all from six to 10 spraying
during the year.
As Paris Green is insoluble in wa
ter and can not be dissolved like su
gar or salt, it is necessary to have
good agitator in the spraying machine
or the Paris Green will settle to tn
bottom of the barrel and the tree
will be sprayed with practically notf
ing but water. Next, after the agitatC
the most important thing is to get q
great pressure as possible. The Vel
morel type of nozzle, which gives
cone-shaped spray, is most often use
with hand pumps. In the case
power spraying machines the Boz
deaux nozzles are more oftener used.
Paris Green is practically the onl
insecticide used against the codli
moth in the Yakima valley. tn
amount of Paris Green used to IL
gallons of water is from three-fourtf
Of a pound to one and one-half pounC
and the amount of lime from four
16 pounds The main purpose of II
lime is to prevent burning of the tre'
by the free arsenic in the Paris Gree
However, care should be taken not
use an excessive amount of lime,
II will impair the action of the Par
Green.