Vol. 16—1962 - NorthEastern Weed Science Society

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ENHANCINGHEftBICIDAt, AC'l'mfi OF SILVEXPoR THE CONTROLO'F"::
DOGFENNELtlf i ;3MA: LL GRAINS' .]-~
,..\"
R. D. Ilriioki* ,
. Dog f~~el (Anthemus o01ii~) oauses se»lous losses in s~n
grainproduotion and is alSO.'l ... ·..p.e.st. in other .•••crops and pasture~.i
in the Northeastern States.,:~ previous wOX'kat this stat~on:
it was found that of the phenoxyalky-loarboxylio aoids evaluated
for post-eI!1ergenoe oontrol the.lf.lpha-phenox;'fQX'op1onio aoids were
the mostetfeetiv'e' in oontr6;ll1ng this speo:1e's~ Little or nOt
signifioant injuxoy to small grains results if these herbioides
are used within a oertain q9~~g~range at. tolerant stages of
growth •. 2-(2.,4,S-triohloroplte. '~.">.-proP1onic.. aoid (silvex) was
the most aotive of this gro\olp.p(J.,,2). ,c .
31r
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InjurYtcJ~i!!EUl gra1ns ~,I):,irnrn1nent )"'l}el;(~pplioationsare
made at er1tioa.lstages ofg.@~p. ~1noe 1nA,ury may ooour r~i
application'rates nec~ssary·'r':Qr;·.dog fennel o~trol an attempt '.'
made to det.elop r.ormulations:W-Woh would be.".ss phytotoxio to .. (
the grain but. whioh would reta1~their speo1(~o1ty for dog r~~l.
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Maten&~ and MethC!4!!, ;, , " _
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Formulat1otisof silvex,~fng high b01li~pararf1nio frao~,~
as oarr1ers,~repX'epared as:aq\?-eous disper~.pns d1frering onlM,in
their emulsU1e;t', ·,systems.The ]1udrooarbon 'fmot1on was a select.
material havingcarbonnumber.sabove C18. One formulation (EAP 4019)
oontained. a s;Low~bX'eaking e~t+ls,3..!'1er and tpe.;p1;iher (EAP 4020) contained
a fast-bX'e~k1ng emulsif'~X' system. ~t.P preparations oQntained
the same hydrocarbon to .perb1cide rat~p. Commeroiallya"rallable
silvex (propylene glyool butyl ether esters) was used as a
standard for oOJllparison with1;ihetwo experi~ntal systems.
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Dog fennel infested ar.ea:~~,Qtbarley (v~J.), : Wong).and wheat
(var. Pennoll) 01lth~ oamPus. .ot:.the New Je~"y ~gricultural Elc,.,
periment StatiOtlwere seleot;ed to receive hel'b~cidal applications
of these mat~t'1al~~ ,Ratesot 1/8, 1/4, 1/~hi,;I~U1d 1 lb. per aore
were applied on AP:rl1 21, 1~6;J.iJn 40 ~a wi"\:;~:an experimental
sprayer or the. typedesoribeq.1;>,¥' Shaw {3). Tbe experimental
design, for the two small g1'Un.areas was a ,pl1t plot with
three. repl:t,oat:1,ons. Rates ot:~'liplioation oonstitute the whole
plots and ~o;rm~lat10ns comPll~e.ltd the sub_plo1lil. Several oheok
plots werealsoinoluded. P1Qts were 6 Jl; 20~feet. At the time'
of appl1ca~:1on1;~ small gra1ns~and dog fenn~l were at the fol.
lowing stages of grOwth:
baz'ley c" jointing I .
whea1Li_ ,la te tille:ll'htB:- early joint
dog;~Et:onel - 2-5" t.all;2,..9" spread)
4-10 t-.111e1's•
Period opservat1ons we~: ~de throughou~:the course of the
experiment ,and ..apyunusual elt'AAts were X!eool'llled. Not~ths~
\.....- that tille~ngappeare'd comR'l-e.i;e. at time of n-rQi.cidal applioation,
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