Common Name, Chemical Name and Toxicity Rating of Some

Common Name, Chemical Name and Toxicity Rating of Some

SS-AGR-105
Common Name, Chemical Name and Toxicity Rating of
Some Herbicides1
J. A. Tredaway2
Herbicides labels are required by law to contain
toxicological information. These provide the
necessary requirements, such as personal protective
equipment (PPE), and re-entry periods into treated
areas. Toxicity is defined as a measure of the amount
of a compound that is harmful or lethal. Toxicity
ratings determine if the pesticide is classified as a
restricted use product, thereby requiring a pesticide
application license.
The information given in Table 1 and Table 2
provides toxicity ratings of the active ingredient of
various herbicides. Be sure to read the complete
pesticide label for instructions on the safe use of the
product being applied.
The toxicity ratings given below refer to the acute
oral toxicity as measured by the LD50. Evaluations
are conducted on test animals, which are normally
rats, over a prescribed length of time. The acute oral
toxicity is the single dose in mg/kg (mg of compound
per kg body weight) taken by mouth or ingested that
will kill 50% of the animal test population. It is
assumed that the same dosage would apply to humans
and is therefore adopted as the standard.
There are other toxicity determinations that are
made including skin or dermal toxicity, eye irritations,
inhalation hazard, and fish or bird (avian) toxicity.
The results of these tests also determine warnings or
restrictions that are placed on pesticide labels.
1. This document is SS-AGR-105, one of a series of the Agronomy Department, Florida Cooperative Extension Service, Institute of Food and Agricultural
Sciences, University of Florida. Revised January 2000. Please visit the EDIS Web site at http://edis.ifas.ufl.edu.
2. J. A. Tredaway, assistant professor, Agronomy Department, Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of
Florida, Gainesville, 32611. The use of trade names in this publication is solely for the purpose of providing specific information. It is not a guarantee or
warranty of the products named and does not signify that they are approved to the exclusion of others of suitable composition. 3.3.1
The Institute of Food and Agricultural Sciences is an equal opportunity/affirmative action employer authorized to provide research, educational
information and other services only to individuals and institutions that function without regard to race, color, sex, age, handicap, or national origin.
For information on obtaining other extension publications, contact your county Cooperative Extension Service office. Florida Cooperative Extension
Service/Institute of Food and Agricultural Sciences/University of Florida/Christine Taylor Waddill, Dean.
Common Name, Chemical Name and Toxicity Rating of Some Herbicides
2
Table 1. Explanation of toxicity ratings used in Table 2.
Toxicity
rating
Signal Word
Class
Oral LD50 (MG/KG) Probable lethal dose for 150 lb. Man
I
DANGER, POISON
Very High
less than 50
a taste to 1 teaspoon
II
WARNING
High
50 to 500
1 teaspoon to 1 tablespoon
III
CAUTION
Moderate
501 to 5000
1 ounce to 1 pint
IV
CAUTION
Low
greater than 5000
1 pint to 1 quart or more
Common Name, Chemical Name and Toxicity Rating of Some Herbicides
Table 2. Common name, toxicity rating and chemical name of herbicides.
Common name
Toxicity rating
Chemical name
acifluorfen
III
5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid
ametryn
III
N-ethyl-N-(1-methylethyl)-6-methylthio)-1,3,5-triazine-2,4-diamine
amitrole
IV
1H-1,2,4-triazol-3-amine
asulam
III
methyl[(4-aminophenyl)sulfanyl]carbamate
atrazine
III
6-chloro-N-ethyl-N
benefin
IV
N-butyl-N-ethyl-2,6-dinitro-4-(trifluoro methyl)benzenamine
bensulide
III
0,0-bis(1-methylethyl) S-[2-[(phenylsulfonyl)amino]ethyl]phosphorodithiote
bentazon
III
3-isopropyl-1H-2,1,3-benzothiadiazin-(4) 3H-one 2,2-dioxide
bromacil
IV
5-bromo-6-methyl-3-(1 methylpropyl)-2,4(1H,3H) pyrimidinedione
bromoxynil
III
3,5-dibromo-4-hydroxybenzonitrile
butylate
III
s-ethyl bis(2-methylpropyl)carbamothioate
cacodylic acid
III
dimethyl arsinic acid
carfentrazone
IV
,2-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo1H
-1,2,4-triazole-1-yl)-4-fluorobenzenepropanoic acid, ethyl ester
chlorimuron
III
ethyl 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoate
cloransulam
IV
3-chloro-2-[[(5-ethoxy-7-fluoro[1,2,4]triazolo[1,5c]pyrimidin-2yl)sulfonyl]amino]benzoic acid, methyl ester
clethodim
III
(E,E)-(
clomozone
III
2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinone
clopyralid
III
3,6-dichloro-2-pyridinecarboxylic acid
cyanazine
II
2-[[4-chloro-6-(ethylamino)-s-triazin-2 yl]amino]-2-methylpropionitrile
cycloate
III
S-ethyl cyclohexylethylcarbamothioate
DCPA
IV
dimethyl 2,3,5,6-tetrachloro-1,4-benzene di carboxylate
3
Common Name, Chemical Name and Toxicity Rating of Some Herbicides
Table 2. Common name, toxicity rating and chemical name of herbicides.
dicamba
III
3,6-dichloro-0-anisic acid
dichlobenil
III
2,6-dichlorobenzonitrile
dichlorprop
III
(acid
dichlormid
III
2,2-dichloro-N-N-di-2-propenylacetamide
diclofop
III
(acid
diclosulam
IV
N
-(2,6)-dichlorophenyl)-5-ethoxy-7-fluro(1,2,4)triazolo-(1,5c)-pyrimidine-2-sulfonamide
diquat
I
6-7-dihydrodipyrido[1,2-a:2',1'-c]pyrazinediium ion
dithiopyr
IV
S-S-dimethyl
2-(difluoromethyl)-4-(2-methylpropyl)-6(trifluoromethyl)-3,5-pyridinedicarbothioate
diuron
III
3-(3,4-dichlorophenyl)-1,1-dimethylurea
DSMA
III
disodium methanearsonate
endothall
I
7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid
ethalfluralin
IV
N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl)benzeamine
ethofumesate
IV
(methanesulfonate
EPTC
III
S-ethyl dipropylthiocarbamate
fenoxaprop
III
(acid
flumetsulam
IV
N-(2,6-difluorophenyl)-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide
flumioxazin
IV
2-[7-fluoro-3,4-dihydro-3-oxo-4-(2-propynyl)-2H
-1,4-benzoxazin-6-yl]-4,5,6,7-tetrahydro-1H-isoindole-1,3(2H)-dione
fluometuron
IV
N,N-dimethyl-N-[3-trifluoromethyl)phenyl]urea
fluzaifop-P
III
(R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acid
glufosinate
III
2-amino-4-(hydroxymethylphosphinyl)butanoic acid
glyphosate
IV
N-(phosphonomethyl-glycine
4
Common Name, Chemical Name and Toxicity Rating of Some Herbicides
Table 2. Common name, toxicity rating and chemical name of herbicides.
halosulfuron
III
methyl
6[((4,6-dimethoxy-2-pyrimidinyl)-amino)carbonylaminosulfonyl]-4-chloro-1-methyl-1Hpyrazole-4-carboxylate
hexazinone
III
3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione
imazapyr
IV
(H-imidazol-2-yl]-3-pyridinecarboxylic acid
imazapyr
IV
(H-imidazol-2-yl]-3-pyridinecarboxylic acid
imazaquin
IV
2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H
-imidazol-2-yl]-3-quinolinecarboxylic acid
imazethapyr
IV
(ethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarbolic acid
isoxaben
IV
N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide
lactofen
IV
(5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoate
linuron
III
3-(3,4-dichlorophenyl)-1-methoxyl-1-methylurea
mecoprop
III
2[(4-chloro-o-tolyl)oxy]propionic acid
metolachlor
III
2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide
metribuzin
III
4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazine-5(4H)one
metsulfuron
IV
methyl
2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino[sulfonyl]benzoate
molinate
III
S-ethyl hexahydro-1H-azepine-1-carbothioate
MSMA
III
monosodium methanearsonate
napropamide
IV
N,N-diethyl-2-(1-naphthalenyloxy)propanamide
naptalam
III
2-[(1-naphthalenylamino)carbonyl]benzoic acid
nicosulfuron
IV
2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]N,N-dimethyl-3-pyridinecarboxamide
norflurazon
III
4-chloro-5-(methylamino)-2-(3-trifluoromethyl)phenyl)-3(2H)-pyridazinone
oryzalin
III
4-dipropylamino)-3,5-dinitrobenzenesulfonamide
5
Common Name, Chemical Name and Toxicity Rating of Some Herbicides
Table 2. Common name, toxicity rating and chemical name of herbicides.
oxadiazon
III
3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H
)-one
oxyfluorfen
III
2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-trifluoromethyl)benzene
paraquat
I
1,1'-dimethyl-4,4'-bipyridinium ion
pebulate
III
S-propyl butylethylcarbamothioate
pendimethalin
III
N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine
prometon
III
6-methoxy-N,N-bis(1-methylethyl)-1,3,5-triazine-2,4-diamine
prometryn
IV
N,N-bis(1-methylethyl)-6-(methylthio)-1,3-5-triazine-2,4-diamine
pronamide
IV
3,5-dichloro(N-1,1-dimethyl-2-propyny)benzamide
propachlor
III
2-chloro-N-isopropylacetanilide
propanil
III
N-3,4-dichloropropionanilide
pyridate
III
O-(6-chloro-3-phenyl-4-pyridazinyl)-S-octyl-carbohothioate
quizalofop-P
III
(R)-2-[4-(6-chloro-2-quinoxalinyl)oxy)phenoxy]propanoic acid
rimsulfuron
IV
N
-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(ethylsulfonyl)-2pyridinesulfonamide
sethoxydim
III
2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one
simazine
III
6-chloro-N,N-diethyl-1,3,5-triazine-2,4-diamine
sulfosate
IV
sulfonium, trimethyl-salt with N-(phosphonomethyl)glycine (1:1)
tebuthiuron
III
N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N
terbacil
III
S-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4-(1H,3H)-pyrimidinedione
triclopyr
III
[(3,5,6-trichloro-2-pyridinyl)xoy]acetic acid
trifluralin
IV
2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamine
vernolate
III
S-propyl dipropylcarbamothioate
6
Common Name, Chemical Name and Toxicity Rating of Some Herbicides
Table 2. Common name, toxicity rating and chemical name of herbicides.
2,4-D
III
(2,4-dichlorophenoxy)acetic acid
2,4-DB
III
4-(2,4-dichlorophenoxy)butyric acid
7