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 CHEMICAL, PHYSICAL, AND BIOLOGICAL PROPERTIES OF HERBICIDES AND PLANT GROWTH REGULATORS -- Continued
Acute Oral
Common and
Chemical Designations1
Toxicity,
Dermal
L D50 (mg/kg)
Trade Name and
(Cost per Pound; and
Manufacturer2
Toxicity
Biological Information and Remarks
and Rating
Commercial Formulation
A RESTRICTED FUMIGANT herbicide that is very
extremely
DOWFUME
35
Methyl bromide
toxic
poisonous and may be used only by certified applica-
extremely
MC-33
($6.00/lb in cans,
tor. It is applied as a liquid under pressure under a
toxic
Fumigant
$1.00/lb in bulk
gas-tight cover, sealed at the edges in the soil. It kills
BROZONE
containers; liquid
most weed seeds, bulbs, corms, and lateral under-
DOW Chemical
under pressure in
ground stems of weeds, as well as nematodes, plant
Co.
cylinders or cans)
disease organisms, and some insects. It should be
WR GRACE &
applied when soil temperature is above 60 F. The
Co.
cover can be removed 2 days after treatment, and
NEMASTER
seeding can be done 2 days after removal of cover;
PESTMASTER
contains low percentage of chloropicron to provide
Stauffer
odor warning.
Velsicol
M8C Soil
Fumigant
Hendrix and
Dail, Inc.,
and others
Soil-applied, preplant-incorporated, or early poste-
2,780
moderate
DUAL
Metolachlor
mergence herbicide. Treatments are made in combi-
to very
Ciba-Geigy
low
2-chloro- N -(2-ethyl-
nation with atrazine for control of annual weed
toxicity
toxic
6-methylphenyl)- N -
grasses, yellow nutsedge, and certain broadleaf weeds
(2-methoxy-1-methyl =
in corn. It is also used in peanuts, soybeans, and
ethyl) acetamide
horticultural crops. It is corrosive to steel and tin. It
($3.00/lb; emulsi
can cause eye damage; wear goggles or face shield. It
fiable concentrate)
is a general growth inhibitor, especially of root
elongation. High organic and clay soils readily ad-
sorb metolachlor and above 2 percent organic matter
no leaching occurs. Its half-life in soil is 30-50 days
in northern areas and 15 to 25 in southern areas.
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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