Vol. 16—1962 - NorthEastern Weed Science Society

60
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1
,ADIl SUBS':U!l'UrEDUREABEBBIClt8, _
R. ,n-~ Swe~~ J. o.C~ne and'acK,rp..:~.
~l'Jtotyqetable Crops, Cornell university
In 1961, the Industrial and Biochemicals Departmeat of the E. I. Du Fon't
de Nemours and Com.PanY, Inc., released to investisators Herbicide Jfo.326with
the technical nameof 3-(3,4-DichlQl'OJlbenyl l)-l~.l-metbyl utea. The
company.listed such attributes as pre-and post-emellpDee activity, relatively
rapid disappearance from soil, aDdreJ.e.tively low :t;~ty to mammals. The
herbicide was susgested pr:lme.rily U "post-emergeDM.t#rected spray on corn
and pre ... mergen~on soybeens. Ot.1MIr-crops which ~\])e treatedwitb directional
sprays were also stated as possibilities. carrots had been fouriii to be
tolerarxb of berb:l;cidal quantities applied. as pre-emerpnt sprays. PreU m1nary
reports indicated pre-emergence a~t1ons could~~Elrated by such crops,
as snap, dry, and lima beans, squash.,4nd potatoes.' ~urY was found. on
vegetables -1ncluding_ cucUlllbers, red beet.s,., and ,:toma~ " ". ". . ,. ,. ,.
The purpose of the tests reported here wastp-o ~~. the .perf9rD18nQeof
326 on various vegeta:bles and nutgrass. Where'pre_rgence tolerance waS
indicated, post-emerg«iUQetea'te _~ se~ly~t·. aJ,~s, conducted..
,1--; L .-.) ~ " ,--j ,
Experiments with Carrots
,,,; 'j . . ',
There were four tests with carrots; two were on coarse sand, one on s~
loam, and one on muck. The two on coarse sand were ab8ZIdoned after pre11.Dl1Dary
n-ote taking due to severe crop damap. trom heavy st~. The muck test aDd the
one on sandy loam soil involved botb'pre";' Ei.Ddpost-emergeat applications of
about 25~tut."
cl1emtcalsatsevere.l-zetes 0Cb. weM.")~8 were lIlBde~t ~.
vals during' the season. "Although· Mrv'est. l1'eCOl'Cls W8ft '~n,. yields are 91-,
questionaelevalue, cbec~" otf~ld rW;J'1ab:Uityp.beClUJSeweeds were.~ x:
relllOved'p~"aa· tUybecame ~nt :I:n tbt.vadc~uB iP~ots. .' , .r c : ,
-I J.:.'"
Weed and crop ratings of the mOre~ign1ficant llBter1als in' both thes8iJdy
loam and the muck soU tests Qe·presented1.n
behaved quite differently on thet"ilO--solls-.In"
t.111e 1.
regard
Several materials
to weed control, the
pre-emergel1ee-applic:AiQlUJ ~C~, ,J:lact~, f'.ytt:OPj~.,~~ and D1J?be"N'1d
were much less, etf~1."thOn mUQkto-. o~lIandy l~,·;;BQveVor, Pre":emerpnce ­
treatments of Dtll'ont. ~6 .as 'weU.·"" .~U'lural~,;~~ ..and mc showed 110
si¢fic:ant 1nfiuence of so11 type on weed control. As wasto be expected.,
post -emerselSce:!lerb:r.c:tde.. ~re .1101; ~u~I;lqed. by. sou, ~ '.: .,. ,.
~'_::"l L ,(i: ~;-:-, ",., " :" ",!' ..,"', '~_ .
Altbo~sb"'~' r,s~e"to .• r1?~s .1n"~'f¥l ..~.1nnuenced by
herbicides, Dipbenamid was exceedingly toxic on sandy so11 and not harmful on
muck toU. ~S1llce ~edpQ::.lt;r91. .. ~ P9Q.r."1,h .J>.1phenamidpn .the
muck, it isprobablt!ltbe.t t.bis ..~... ' 1.&1 ...was.eit~ ...~~.~ rf- ..18bt.~.... adsor'!Jed or'
quickly broken.aown_ S,1Doeop.,~.aoU ~phe . '_ ;.'p.~ ~tive1Y long
lasting results, it is unl1ke~ that decompositioll'" as1mpoi"tant as
adsorbtion. .c" ,-" •
, f·