Rocky Ford enterprise., 1901-02-22
EXTENSIVE EXPERIMENTS
WITH COOLING MOTH.
xapt. 6rifila Makes . Condemned Re
pert Of careful Experiments
IL YsirSiew Orchards


! herv-iih present some not-. foe qualifications
relative Z" the esiiias moth. that have been
coiteet@d by the station. mos, OF which has
b--n collected in the orchard OF Hon. J. II.
Crowley.
rhs objects NO have had Ia vies arc as
follo..s To determine has ioas IL iakrs III.
larvae Ia undergo their Transformation and
app-sr y. moth.
To d-t-ru.iso the tssinnins "s the appesE
ane- OF tho second bDs.i OF usuths-
To note II there /. . inaS-Hirnt OF tbs hIter-
mating larvae pFvNioa. Ia the hs,shins OF the
moth in sIrin=.
To ,ieturnins when the worm. esn- from
the appi-s that Ia no, pnENai. aatii the next
.ptins.
To nni the prE eeni Of tho worms that are
taken By tho lsni..
To md tho ..Iff.rrne- In tho Per c-n, Of ap-
pie. oa sprayed ami uA.pray-si trees and tho
bsnrrt derived through the destruction OF
the nr., brood.
To nnd tho pcr cent IS! worms In ,hs apples
al sinie of harvest.
II 1. found there 10 vide range In the
time u takes tho moth ta app--ar from the
SOFA. from number OF softn. taken frotn
time "a. ~ days AMI tho longest = days.
frou n number 81 pupaS issca the shortest
O-ins a. ID. ~ide VARIATION In the time In
which the moth forms th-f- :. an equal yuri'
alton In the appearance .f the worm. there
I. ma veil defined time at when tho dncrrnt
broods Hpt~ar. but th-rr IL sr..ation In the
apprarane- 81 the ~ortns sni time can tc
bFoad would be pronisbic " it is 10 bc done
Three block. Of four tree. each were used
exclude the moths for the 1rss brood and an.
other block screened To exclude the second
brooi We will call ihi. block and tho for
Tres. Numbered and OF each block ~err
sprayed tvicr " spring. and trees and I
The appearance Of III. nrsi moth. I. about
the middle Of May. About the middle OF July
On slass : The nrsr worm, appi.. were
found August II. The hr.t ~oriny apples
found ~ spring was June d and the hrs'
II take. about one month from the hatch.
In. OF the moth I'LL the worm appcars In tho
Thirteen tree. were bandc,iMarrh ID for the
purpose of studying the Id question. Tho
ircc. were those under which apples had
April q found worm. and May two worms
under the bands.
This goes TO show there Is some movement;
OF the alternating larvae.
Question I. Hy collecting many worms Mt
Intervals OF about week during tho season
u !. found that the time at which the worms
fall to pupatc l. nbout the last week of Aug
ust. This l. OF Importance to the grower. for
IL tells the time at which lie may rcI,.. the ln-
Dor 81 looking To the bands: the tinsc nctns
nbnut september I.
Taking block TO secure an answer 10 the
question of the per cent of worms tnat NAV
bc taken 10y the bands We ind there were $40
wormy apples and us worms were secured. or
-entcd by wha; we're taken under the Isnis.
III course. many worms wcr. In the apples
when picked. Our trials show that nj harvest
time about 10 per cent OF the worny apples
On the trees stili contain worms. 81 thai "
the lan,ls nrc looked tn diligently aud the
worms In the apples secured. the greater pro-
4
Now let us look nj the difference In the per-
cent OF fallen apples. due tn worms. on the
sprayed and un-praycd tree. In block ). This
Is for the first brood OF worms only. rs the
spray Affects only tho first brood. On trees
and 81 sound apples dropped On trees and
! there wcrc la wormy and 20 sound-prac.
tically the same number OF sound. hut over
times as many wormy on the unspraycd.
~ormT and ii sousd apples falling from e the
ita wormy and ~ sound. Again the number
OF o.; sound nd. apples arc nearly the same but
the m ~orms on the
the injury from the first worms and conse-
brood. ' ''''' '"' ''"'''' Vi '"' s'e'h'
Let us look at the benefit from tho spraying
K We carry the record through to the end Of
In block We have on tho sprayed trees &c
pcr cent OF the apples wormy; on the un.
sprayed trees We have ~ per cent Of the ap.
II we take block /. wo have "a per cent of
the apples wormy on the sprayed trees and 10
per cent on the unsprayed-both blocks run.
ming quite uniform,
Let us compare with block Q. that had tho
nrst brood kept from the trees by screens:
me sprayed trees show 30 per cent of the ap-
pies wormy. and the unsprHycd tree. "a per
cent OF wormy applcs-practicnlly the same
amount on each. The three lots show n gain
OF upper cent from the spraying, TO say moth.
ing OF the additional worms there would he in
late season were It not for the destruction
carly by the spray.
II. Fl. GRIFFIN,