Agriculture Reference
In-Depth Information
m.
Cyclohexenones
This group includes sethoxydim, clethodim, cycloxydim, and tralkoxy-
dim. These compounds are used as systemic postemergence herbicides to con-
trol annual and perennial grass weeds.
Mode of Action and Toxicity
These compounds are inhibitors of lipid biosynthesis and auxin activity.
These compounds are moderately to mildly irritating. Several formula-
tions include solvents which may be irritating.
Table 5.18
Commercial products containing cyclohexenones.
Active Ingredients
Trade Names
Sethoxydim
Poast
Clethodim
Select
Cycloxydim
Focus, Laser, Stratos
Tralkoxydim
Grasp
n.
Imidazoles
Several of these compounds are popular, nonselective, broad spectrum,
systemic herbicides. However, imazamethabenz-methyl is used as a selective
postemergent herbicide.
Mode of Action and Toxicity
They are absorbed through the roots and foliage and translocated to the
growing or meristematic regions of the plant. Several members of this group
have been shown to inhibit branched-chain amino acid biosynthesis.
Several members of this group are mildly irritating to skin and eyes.
Table 5.19
Commercial products containing imidazole compounds.
Active Ingredient
Trade Names
Imazapyr
Arsenal, Chopper
imazaquin
Image, Scepter
Imazethapyr
Passport, Pursuit
Imazamethabenz-Methyl
Assert
o.
Oxyphenoxy Acid Esters
Mode of Action
This is a relatively new class of preemergent herbicides active against
most grass at economical rates, with very little activity towards broadleaf
