Agriculture Reference
In-Depth Information
Formulations of terbacil currently available are listed as relatively nontoxic,
Toxicity Category IV.
Table 5.26
Commercial products containing uracil compounds.
Active Ingredient
Trade Name
Bromacil
Hyvar, Uragan
Terbacil
Sinbar
Lenacil
Adol, Venzar (lenacil is used primarily in Europe)
v.
Sulfonylureas
Introduced in 1982 by DuPont, this group has made a major impact on
weed control technology. They are remarkable active compounds, selectively
controlling many dicotyledonous weeds in cereals at very low dose rates, and
they have very low mammalian toxicity.
Mode of Action
The sulfonylureas are potent inhibitors of plant growth; seed germination
is generally affected, but subsequent root and shoot growth is severely inhibi-
ted in sensitive seedling. Death follows chlorosis and necrosis.
Sulfonylureas are generally formulated as wettable powders or water dis-
persible granules, and the compounds are readily absorbed by both the roots
and foliage of plants. They are translocated by both the phloem and xylem.
Toxicity
All the products below, with the exception of Permit, are relatively non-
toxic (Toxicity category IV). Permit has an oral LD
50
high enough to be in
Toxicity category III.
Table 5.27
Commercial products containing sulfonylurea herbicides.
Active Ingredient
Trade Name
Bensulfuron-methyl
Londax
Chlorsulfuron
Glean, Telar
Chlorimuron-ethyl
Classic
Halosulfuron-methyl
Battalion, Manage, Permit
Metsulfuron-Methyl
Ally, Escort
Nicosulfuron
Accent
Primisulfuron
Beacon
Sulfometuron-Methyl
Oust
Thifensulfuron
Pinnacle
Triasulfuron
Amber
