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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
Pronamide
KERB
5,620-
slightly
A selective, soil-applied preemergence herbicide for
3,5-dichloro( N- 1,1-
Rohm and Haas
8,350;
toxic
control of broadleaf and grass weeds in lettuce,
dimethyl-2-propynyl) =
slightly
legumes, small fruit trees, Christmas trees, and
benzamide
toxic
woody ornamentals. It controls annual bluegrass and
($26.00/lb; wettable
annual ryegrass in bermudagrass turf as both pre-
powder)
and postemergence treatments. It is most effective
when there is rain or sprinkler irrigation soon after
treatment. Shallow incorporation in soil is beneficial
in dry areas. Pronamide is absorbed by roots and
translocated upward. It is a strong inhibitor of
mitosis in cells, but may have additional effects. It is
readily adsorbed on organic matter and other colloi-
dal exchange sites. It is degraded microbially, and
under hot, dry conditions it volatilizes. Persistence in
soil ranges from 2 to 9 months.
Simazine
PRINCEP
> 5,000
slightly
A soil-applied herbicide for the selective preemer-
2-chloro-4,6-bis =
AQUAZINE
slightly
toxic
gence control of broadleaf weeds and some grasses in
(ethylamino)- s -
GESATOP
toxic
many crop and aquatic weed situations. At higher
triazine
PRIMATOL
rates, it is a nonselective, noncropland herbicide. It
($4.00/lb; wettable
Ciba-Geigy
has little foliar activity, being mostly absorbed by
powder, flowable
SIMAZINE 4G
plant roots. It is translocated upward through the
liquid, granule)
Miller Chemical
xylem of the plant. It is a photosynthesis inhibitor
Co.
and may have additional effects. It is readily ad-
sorbed on muck and clay soils. It leaches little
because of its low water solubility. It is degraded in
the soil microbially. At higher rates it persists in soil
for more than a year. Its half-life in ponds is about
30 days.
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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