Vol. 16—1962 - NorthEastern Weed Science Society

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3-(3 ..4-Dichlorophenyl)-1-methoxy-l-me~y~\1t'ea3 under t~
trademarl< name of ''Lorox'' WeMKiller has.received federal label
registrations for pre- and post-emergence Use' in field corn grown
for grain and pre-emergence use on soybeans grOl'm for seed. '
"Lorox" tleed luller .. formula~d as a 50% wettable powder .. will
be available for sale in l1~~~d quant1tie~ during 1962 forqpth
crops.
Physical and Chemical Propeie~es
Pure 3-(3 ..4-dichloropbenyl)-1-methoXY;c1"'methylurea is a l
white crystalline solid (m.p.,~3-94°C.) wi~p.a low vapor pressure.
Its solubility in l'later is 7~.ppm at 25°C. The compound iS8~ble
in water but decomposes slawly in acids and bases. It is subject
to microbial decomposition tinder moist con4~tions in soil.
Toxicology
and Residues
The approximate lethal. dose (ALD) by q#al administratioq .eo
male white rats is 1500 mg./l~. body weight. vJhile the chemiA.al
causes slight :l.rritation totne. skfn and e~s .. it is not a,
sensitizeX'. Long-term c~onicstudies are ,'in' the second. year:
and the results indicate no toxicology problem. Analyses have
demonstrated no residues in corn grain." .
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Pre- and Post-Emergence Weed Control in Com
Summary data are now available from a.total of 73 tests
conducted over a two-year period in 21 states. Tests were conducted
on different corn varieties and under representative
conditions of soil type .. weed $Ol'lth .. and-weather conditions
existing in the major corn-l>re,4ucing areas ••
Results from pre-emergenc;~' tests Show~hat soil type is d1e
predominant factor in the selection of effe~tive use rates. In
the Corn Belt on silt loam and clay loam soils of moderate to
high organic matter .. effecti~ ~ontrol was pbtained with rates
of 2 to 3 pounds 4 per acre. No' crop irijurywas obtained at ~ce
;'
..,J
(3) The du Pont Co. has propOsed formally to the K-62 Committee
of the American Standards ,Association that the term 'linuron'·
be established as the approved common (aeneric) name.
(4) All rates are expressed on an active ingredient basis., "