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 CHEMICAL, PHYSICAL, AND BIOLOGICAL PROPERTIES OF HERBICIDES AND PLANT GROWTH REGULATORS -- Continued
Acute Oral
Common and
Toxicity,
Chemical Designations1
Dermal
Trade Name and
(Cost per Pound; and
L D50 (mg/kg)
Biological Information and Remarks
Toxicity
Manufacturer2
and Rating
Commercial Formulation
Preemergence control of annual grasses and several
slightly
1620
PRE-M
Pendimethalin
broadleaf weeds in turfgrasses. Use only on well
toxic
moderately
LESCO
(N-(1-ethylpropyl)-3,4
established turfgrass with a dense and uniform stand.
toxic
dimethyl-2,6-
Do not use on newly seeded or sprugged, winter
dinitrobenzenamine
overseeded, or turfgrass thinned by winter stress. Do
($10.70/lb; water
not use on bentgrass or dichondra.
dispersible granule)
A RESTRICTED HERBICIDE. A selective, foliage-
slightly
8,200
GRAZON
Picloram
or soil-applied herbicide that controls many broad-
toxic
slightly
TORDON
4-amino-3,5,6-tri =
leaf herbaceous and woody plants, with little injury
toxic
Dow Chemical
chloropicolinic acid
to most grasses. Higher rates of treatment are re-
AMDON K
($42.50/lb; granular,
quired for soil treatments than for foliage sprays.
Union Carbide
pellets, liquid)
Picloram is extremely mobile in plants and is translo-
cated, particularly to new growth. Mode of action is
similar to that of 2,4-D. Symptoms include cupping
and stunting of leaves, bending and splitting of
stems, and deterioration of roots. Although certain
plant species, such as mustards, spurges, and kochia,
are resistant to picloram, others are killed by minute
amounts. Picloram is often used in mixtures with
phenoxy herbicides such as 2,4-D. Picloram remains
in soil longer than 2,4-D. It disappears more rapidly
under high rainfall or high temperature conditions in
coarse textured soils. In cool, dry areas, picloram
residues may injure sensitive crops for more than a
year. Drift of sprays to nontarget crops can cause
great loss. Special care should be taken to avoid
contamination of irrigation waters. Picloram also
may move from the treated area with surface runoff
water to affect sensitive plants along drainage ways
and downslope.
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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