Albuquerque morning journal., 1915-04-06
State COLLEGE
STATION ISSUES
FRUIT BULLETIN
Importance Of Spraying Is En-
pahSized and Information
Given as 10 Time and Man
ner Of Doing It,,

tspEeiAl eoRsEsronotnes TO nonHiss JOURNAL |
State College, ~ NJ, April 5.-Thc |
agricultural experiment station OF the !
New Mexico College Of Agriculture !
and Mechanic Arts has issued the fol- |
lowing bulletin on the subject OF |
spraying pome fruits:
The pear, apple and ounce belong |
to the peme fruits These fruits are |
subject to the attacks Of the codllng |
moth The late rlpening varieties OF
these different fruits, as rule, suf- |
fer more from the codling moth than
the early ripening kinds, because the
later broods of the codling moth are
considerably larger than the early
broods. In the warmer ana lower |
valleys the unsprayed orchards are
liable to have more wormy fruit than
the orchards of the same varieties in
the cooler and higher attitudes mi
the higher attitudes there are not as
many broods Of the codling moth nor
as many worms of the different
broods consequently 1t is necessary TO
subject OF spraying the pome fruits,
In the lower and warmer valleys than
II might be IN the higher districts
Entomologsts have observed that
the life cycle of the codling moth is
approximately seven DAYS from the
egg to the larva; nineteen days from
larya 10 cocoon stage; eighteen days
from cocoon stage to the emerging
of the moth; five days from the
emerging of the moth to the middle
Of the egg-laying stage. being approx
lmately forty-nine days or seven
weeks. Since the life of the summer
broods is approximately fifty days
and Il the broods did not tend 10
overlap, as they do In southern New
Mexico. ,hree sprayngs would prob
ably be enough for the number OF
broods that have been observed AT the
experiment. station. II Is found,
however. that the broods overlap and
that there is a continuous stream Of
larya coming out during the growing
season.
Spraying Schedule.
In order that there might be q
more or less definite period st which
practical crchardists may apply the
spray. a spraying schedule has been
worked out at the experiment station.
based upon the number of the broods
and their habit OF emergence.
The first spraying is given when
NUOWl NV " AN' HAl AfllN VI .Allf htbN7
SONS are off the trees This Is a calyx
spray, and should be applied with
considerable force and be somewhat
coarse. The second spray is given
about twenty or twenty-five days af-
ter the first one, The subsequent
sprayings are given every twenty-five
DAYS after the second one. If this
schedule Is followed the orchardist is
more likely to get the spray on all Of
the fruit Just before the maximum
number Of larva of each brood Is
ready to enter the fruit and also
have the poison on the fruit for the
larva which emerge between the max
imum periods, The number OF spray
ings necessary for the beet results de-
pend upon the locality and upon
whether the fruit Is early or late rip
ening. Under valley conditions at the
station it has been found that ii pays
to spray the late ripening varieties
from five to six times. In the higher
attitudes this number of sprayings
may be reduced to three or four. For
the early ripening varieties two or
three sprayings give excellent re-
suits
Results Encouraging.
Last years spraying results for the
BdiIltll DtdI .WtIt WHY HntONiRh
The Bartlett was in full bloom on
April 10. The maximum number of
moths of the wintered-over larva
emerged during the first ten days in
April. The larva from the maximum
number OF the wintered-over moths
were ready to enter the fruitsat APP
proximately April 20. The first or
calyx spray given the Bartlett pear
trees was on April 20. This spraying
was thoroughly done with power
sprayer using $50 pounds pressure
A Bordeaux nozzle giving coarse
driving spray was used, one and one
half pounds of the dust form OF arse
nate Of lead was used TO fifty gallons
OF water for the first and second
sprayings The second spray was APP
piled on May 1G The third was APP
Piled on June IS, five days later than
the scheduled time because the or
chard had been irrigated and was TOO
muddy. The fourth spraying was CIV
en- on July 10. Three pounds of the
paste form of arsenate Of lead was
used for the third and fourth spray
ings. The last three sprayings were
applied with Nermorel nozzle, giving
fine, cone-shaped spray which
seemed TO coat the pears with arse
nate of lead very Well
on July 25th, $40 pears were gath
cred from tree l. All of these were
sound. on August 18Th. l54, 217, 299
pears were gathered from trees 2. .
and 4, respectively On tree 2, two
wormy pears were found There were
1,1dS sound and two wormy pears
gathered from the four trees. giving
over 80 per cent sound. on August
18th, from two unsprayed Bartlett
pear trees 4SS pears were picked. IT
being wosmy and 274 sound, or 56.2g
per cent sound The figures show that
the spraying saved over 4S per cent
Of the crop from being wormy.
1t il likely that three sprayings VIII
be sufficient for the Bartlett pear in
The lower ard warmer valleys.
1t is necessary for the best results
that the spraying be thoroughly done
and that It be applied at the right
time
Mrs VI T. Soma DleS