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 CHEMICAL, PHYSICAL, AND BIOLOGICAL PROPERTIES OF HERBICIDES AND PLANT GROWTH REGULATORS -- Continued
Common and
Acute Oral
Chemical Designations1
Toxicity,
(Cost per Pound; and
Trade Name and
Dermal
L D50 (mg/kg)
Manufacturer2
Commercial Formulation
and Rating
Toxicity
Biological Information and Remarks
Hexazinone
VELPAR
1,690
It is applied as a foliage spray or a soil treatment for
slightly
3-cyclohexyl-6-(dimethyl=
control of many broadleaf and grass weeds, as well
DuPont
moderately
toxic
amino)-1-methyl-1,3,5-
as woody vines in noncropland areas. Less effective
toxic
triazine-2,4(1 H ,3 H )-dione
on Johnsongrass. At higher rates it will kill many
($22.50/lb; water-
woody plants. Where properly applied, it can be used
selectively in Christmas tree plantations and refores-
soluble powder, miscible
liquid, pellets)
tation west of the Rocky Mountains. It is readily
absorbed through both foliage and roots. It is
translocated primarily upward through the xylem. It
appears to be a photosynthesis inhibitor. It is de-
graded in soil microbially, and has a half-life in soil
ranging from 1 to 6 months.
Linuron
LOROX
1,500
moderately
Applied as a preemergence soil treatment for control
3-(3,4-dichlorophenyl)-
DuPont
toxic
moderately
of broadleaf and some grass weeds in crops such as
1-methoxy-1-methylurca
toxic
soybeans, cotton, corn, sorghum, potatoes, celery,
($13.00/lb; wettable
carrots, and parsnips, and in ornamental crops and
powder, flowable
turf. It is readily absorbed by roots, less so by
suspension)
foliage. It is translocated upward through the xylem.
It is a photosynthesis inhibitor. It is adsorbed by soil
similar to diuron. It is degraded in soil microbially.
Half-life in soil is 2 to 5 months.
Maleic hydrazide or MH
DE-CUT
slightly
6,950
Growth regulator that provides foliar growth and
1,2-dihydro-3,6-pyrida =
Maintain 3
slightly
toxic
seedhead suppression in turf. May be tank mixed
zinedione
MH 30
toxic
with chlorflurenol to provide broadleaf weed control.
($4.40/lb; 2S, 3S, or 4S;
Retard Slo-Gro
Has no soil residual when used properly, and is
water-soluble liquid)
Slo-Gro
rapidly degraded by microorganisms.
Uniroyal
Drexel
Fairmont
1
A chemical name occupying two lines separated by an equal (=) sign would be joined together without any separation if written on one line.
2
Mention of trade name or company is for information only, and does not constitute an endorsement over other products not mentioned.
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