Daily Kennebec journal. [microfilm reel] (Augusta, Me.) 1870-1975, 1901-07-24
THE COLORADO POTATO BEETLE.
ELECTS Of Poisons With ard Without Bordeaux
Mixtur, on Badly Infested Fields.

~ seri'S o. experiments in 1901 II was
found that three applications Of Paris
The acr al is sns ,ai% Of one-haf pound to
free from the Colorado potato beetle pro
vldcd the sprayings are made at such
, ZINES as 70 nave the poison on all the
foliage when the bugs first hatch
Every year many ~otato growers wait
uftli the vines are well covered with the
odSs before BEGINNING to fight them and
a.eh me Station Is in receipt of letters
OF complaint against the Quality of the
polsonS and requests for analvsis As
TINS condition o. eaten vines covered wit N
bugs is ever recurring it was decided to
make a test of the effect of different
amounts OF poison upon tho hugs an a
badly infested field. Since it was thought
the presence OF the copper salts in Bor-
u ,h mixture might effect the results
the poisOnS were used both with and
without the Bordeaux mixture AS no
practical remedy other than arsenic has
thus far been found for the potato beetle,
arsenatc Of copper paris yreen1 and ar
senate of lead We're used
The field seiected contained Il to q
acres. The bl"S We're very numerous an
some OF the vines were badly IN. The
pois"ns were applied with Il mechanical
i-fowed sprayrr fitted with powerful.
pump and double Ncrmorel noZzl,s \
barrel of each mixture was so anriied as
70 cover Il little more than one acre The
PariS green was applied ut the rate of u,
|. and , pounds per barrel of fifty gal
Ions both with and without bordeaux
mixture. The arsenate of lead was APP
piled at the rate Of |. and 3 hounds
per barrel hoth with ana without Bor-
icauX mixture.
Where PARIS green was used with the
bordeaux mixture linn. was added at the
rate of ) pounds to the barrel in order to
prevent the burning of the foliage. While
arSenatc If lead does not burn the foil
age. the lime was applied with it in
order that the methods of application OF
the po.sonS should be comparable
led I,a m
ing of Tuesday, j ally .. Late in the after
noon Of July loth. there was hea -
shower The observations Were made
early Friday morning. July 18th. The ar
ranGcment and treatment of the liluts fol-
low:
Because the centre Of the field was
more badly infested than either end. tho
spraying was begun with both Paris
green and arscnate of lead from the cen
ter. Plot "a was at the extreme north
of tho field and plot 20 was AZ the eX-
IRENE south In reporting below there
ar" ARRANGED in accordance with the
kinds and amounts of poisuns used rather
than in the arrangement n the field.
NlFI. d: ID. Paris green: 3 lbs. lime. y
good many bugs still left on some plants.
Some badly eaten plants cleaned from
bugs, others sim badly infested.
GO. | lJ i,ariS green; . lbs lime. Some
bugs still left. An occasional plant
,adly infested. Cleaner than +.
db. us, Paris green. lbs. lime. N
cleaner than q.
quite free from bus. Only few on o.
Xxx. j. TO- Paris green Bordeaux my
tUre. Very few bugs.
III. | 10. Paris green. bordeaux mix
tire. Mach tAe same as *.
(Nl. > lbs Paris green. bordeaux
mixture. Not quite as clean a. l. ana
m i,S nj ;,I As Clean i's a. n. H. II K.
tEl This plot lies next 10 + IN the
field. ! H.. arsonate of lead; ; lbs hm'
10. III. arsenatc Or lead 3 lhs. lime
Rather better tnau f..
,Cl. lbs arsenate II Lead , his. lime
Not as clean as II or +.
CRp. III. arscrate Of lead: Bordeaux
mixture Better than 4. About the same
III. It's. arsenate Of lead. Bordeaux
mixture. Very clean. about the same AS ID
co.. Olu the field this piot lies next u
NJ. Z lbs arseuUtr of lead. Bordeaux
mixture Very clean. m1cn cleaner tnal
From Till above X il seen tnat Paris
green with Bordeaux mixture was more
Elective u.an Paris green with"ii w
icrGcaIN- tt Was expected that tar III
| suit world br otherwise. as ~ other cases
the hugs seemed to dislike ana AVOID IN
,uuuer salts as tar as possible. III is pro
| ',ab q that WednesdAv's shower wasArC
off the Paris green when applet VIII
white wash dime but did net eneGI i
III much when ii was applied with Ger
| dcaux mixture. IL.
The .rscnatr of lead seemed to ki-
eauallv as well whether applied w
| lime or with TIE Bordeaux mixture ms
| ran probably BE- explained ~ tn" u
| that :trs.nate OF lead when once dried i
! with difficulty washed from tn fuIi9eC
| The arsenate of lead killed better thA'
| did the Paris green. This may ne tN,
| MANNED bv the washing of BY "a" SNOW -
| nf the Paris green BOTH with ana W.lt!oU'
| bordeaux mixture. ..1 II,
| !. pound OF Paris green or p"ihH Oh
! arscnate of lead applied with me BOT
JaI1X mixtur. WAS effective in cltanlhs
| IN badly infested field from thp Er'''
| ua ioritv AZ the bugs. When pi'th's Ill
m1kins as rapid growth as We're th'S'
| nntatucs teach stem growlnS ABOUT al
| iirrn q daV1 il is Impossible" with ohT ~,
| ,Jir.,tinn to entirely FIRE" them from "'i'r
/ h.e,lisr there will always 4" htW ltdN Il
| wv ~. hugs to crawl onto ana lttu "ir"
| In IN, opinion Of the writer III "fu'
IN kin potato bugs with p"ls9hS liitrr d 4!
! twn im6urtAnt things 10 nt "pI.i 'ti =
| t',rst Inc puisou must be as evenly HI
| triiIita "A az POSSIBLE over the entire pau
| t,J in tbr case Of infested htldS, tI't ~
,,,,,Iir,tinn must lac followed IN one -
! - ~, nv. hy a second appliCatInh III "'"'
| ~ i.iiI ihc hu.S on tn, new irllaS'
~ TIT ~ CHARLES -. W. ~
Director