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Vol. 16—1962 - NorthEastern Weed Science Society

Vol. 16—1962 - NorthEastern Weed Science Society

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298<br />

.. ' .. _ ' "'. ," ," lj(,':.'~,.),: '. ':.'~~I:"_' ~ . ,: "1<br />

Al~hO\lgh r'4uc~ionll in the ,)'~fUj;o,rhizOlD8l1 a... ~carbohydrate. re.ultecJl '<br />

f,rom aU he,'tb.iC.~de.·I..t..,~" t,h..e, ~hem.iC"....<br />

degree of the d.pl.t~ol)lI. ~ey .'lt9,r ••ponded dUfet.ly in tile intarectt'"<br />

With cultural ttaabaenU'I~ .,,><br />

1;I.tl". .f, '.. reofil'O'l)l,l'i". rQJy' in thente, period all4<br />

. . ,,:.,',. ,';'1 ,'.'<br />

Delaport, A1pit1iol-~: and Atrel~q., tI!~~ Ibowed lIomawhU,l1l11lar afhcu onj'~.ckgra..<br />

foliage.' In aU :!:lallell, the 1;CtpIJ:l>Vthcealed,.' -rlll'a t1llle .of app UcaUOII, and<br />

gradually diedback'after about two .. ekl. Little or no regrowth occurred<br />

thrCNp'ou,t t~• .,J.l'OW~~i,l~alon on .~t~.Il!~e tr.ate4u4:or plowed piou.lOD the"<br />

under8~undor8~n.. and. c.rbohydraty" (..b""ever ,~l.p., lIbowe4 very littla, 'P:<br />

reduc~.l.on.duritil tha fiut three ~~..~ch of eM 'i_ctton in yield of~; , .<br />

rhilome .... nd fructQle.tbat occurred ·bylata ..faU WalMCO'fered by the folldlriq<br />

Iprlns~, Aaui1:~O~-~" _hUe lbowiOS,a ,.~ rapid and.qeNncluctiOll in both<br />

rbi.omellalld carbobydratel, wallll~~ jto DelapOQ,1Q:A:Mtitreached it.; ....<br />

effect bylat~ fall,' d1lllinbhi~ .~t by Ipr1q. ,;;-,,·.ffect of Atrad_Jw ..<br />

lIIOlttapidandcciaiplete,relulting ill'd.ltruction of virtually all rhizomel and<br />

carbl)hy~rat.1 by late f.U. ,,:, :" .1\"<br />

, i~ ',<br />

The eff.ectl of.IUllluine and P~ ,' >0' ':1.1 'Ji~ "'-<br />

Alt' the ,he,r~~c,~~... appl1ed ,difl ~relpond equa1iiy,« in the 18me way'tw' ,<br />

culturaltrea~'ntl~ The herbicides, lilted in the order of their dependency<br />

upon pl~iDg fo~, ~ff.c;tiv~, contrOl" ,1,l¥8Iured by,ehe l'e4ucdon of rbizOIIIIti' and<br />

food re.~~el!.,.~." followl: D..lap~, renac, 1tm1trol~T. Slma&ine and Alultrail.<br />

J)a l~potl art( renae Ihowed no ,~It~~~~~Y to caule 4i.e~t" dea tb and decOllpol'Uon<br />

of quackara~s ~~~~clIII.. w.h~D not h~l~.~ 'by tUlale.,.'Ac;~adua1 andtemporar, . '..<br />

reduc.tion.inJoo4re,ervei (.nd rhi,l!!M, yield took place.' ,HOwever, thhha,Ni'en<br />

over cOllI! by 'tllefC)tl~JQ8 .pnng. ',: s:L ,.<br />

. ': .... \. ,,', .. ' " .' .<br />

Itmitrol-T'relulted in greater reductions on unplowed plots than Dalapon or<br />

Fenac, but was: sUll 1II0re efficient if followed by plowing_ Simaz1ne ao4 :'_::,'<br />

Atrazine resulted in greater depletionl of rhiz~el and carbohydratel than ~be<br />

other herb,ic14ea ,eiepll,r with or wl,t.h~tt1lla8e. St.ma:a&utwal benefited.l!flhtly<br />

by plowin$'~4trad~•., ilpwever, lbow. noincreale in effectivenell from,eitWel'"<br />

plowina or'f~~~01f dnc:e~o live rb;1&.... : remained by 1ft., fan. I.,<br />

:; .,' '<br />

Llteratyte<br />

i;i~ei'<br />

.. . ' ~ "t:··'· ,:, ,~, ,<br />

': '(1) LeBaron, H.,H. arid FerUg. S.· H. Relationship. between control of<br />

quackgt'an (.vL'mY£.Q!1 URSD.!) aud carbohydrate content of rhh OllIeI •<br />

Proc •. ~.F;.W,C.C.14:357~362. ;(l.~.(;) . b<br />

:, . " . /' ;,-' :--. :,,:o/,.~... . ,;;',:.:'<br />

(2) LeB~r~~,Jl~) ... ,;.• nd~ert18, S.,". ~ effect:. ofclua1c.l end culturel<br />

tr~atllla)1t." ,on the, fpod relerv~~tua~kar... rh£b:oiIa.', PrClC. H.E.W.C;'e.<br />

15:319';'328.' (1961)

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