Vol. 16—1962 - NorthEastern Weed Science Society

348
J
I
Introduction
SELECTI~~~~uirm~:t~~~ID:fTH A NEW
'G. ·n.~,~~l# _A~.)ii;~~:' ancfll~[.~ y~er2'
. ",'
,ae.ul1:s fromexterrsive. UbOratoryCana JtS.eld studies- have ..
de)bOn,.ttatedtt\a~,:~,...(3~4"d:L~~bt~n;yl.) .~,:,.tf(~::-l-methylurea
is a l't'omisil'lS .agrteultural chiuiieal f"or co:rnni~Cl soybean culture.
This compound, coded as Herbic:lde 326# combine.. 'both post-emergence
and pre-emergence herbicidal activity on annual weeds which
.pe~ts~l~d ~i~"tur~a .~Qmc.~urrent; .~~fh,on1:2;o~
p~a9t"'~'•• ~~_
crops. . B~8' • "'1i.flUle .:~od~t provides,'~tbl'roorngrower with
a choice of two methods of.ed control. For greatest economy#
it may be desirable to use a rotary hoe and po8tp~e the use of
an herbic:i:tde·until: a weed,#.oblem develop,) it fr 1':he:'corn field~ . c­
Under such circumstances#'Hirbfcide 326'a, .odttected post-emergence
spray will eliminate most existing annual weeds and give
residual control of weeds which germinate later. lo1hereearly
protection is desired# application to the seed bed shortly after
corn is planted will give pre-emerzence control of germinating
weeds.
Results from widespread tests on a range of soil types have
demonstrated that Herbicide 326 will provide effective pre-emergence
control of annual l'18edswith safety to soybeans. Good to
excellent results have been obtained with pre-emergence and postemergence
applications of Herbicide 326 on carrots.
Herbicide 326 has a favorable pattern of disappearance from
soil after the desired weed control period. Bioassays with oats
have shown no detectable soil residues 3-4 months after treatment
and fall-sown cover crops have grown normally.
(1) Contribution from the Industrial and Biochemicals Department#
E. I. du Pont de Nemours & Co., Inc.# Wilmington,
Delaware.
(2) The valuable assistance of L. E. Cowart# D. W. Finnerty#
F. J. Otto, H. L. Ploeg# M. B. Weed and A. W. Welch of the
du Pont Co., and commercial and institutional investigators
is gratefully acknowledged.