A part of the College of Agriculture, Food and Natural Resources
Mode of Action
Disrupts cell permeability (membranes) by producing free radicals, activated by sunlight.
Injury Symptomology
Foliar activity - activated by light and causes foliar burn at site of
droplet deposition. Plant leaves will have a limp, water-soaked appearance, followed by
browning (necrosis) of plant tissue. Drift injury will appear as speckling on leaf tissue.
Mode of Action
Inhibition of protoporphyrinogen oxidase
Injury Symptomology
Mostly foliar activity - browning and necrosis of leaf tissue. Reddish brown spotting on the leaf surface may appear shortly after the herbicide is applied. Susceptable plant leaves will yellow and then turn brown and die. Plants that do not die may be stunted for a week or more. COC and other additives, as well as extremely cool or warm temperatures may increase plant injury.
Mode of Action
Inhibition of protoporphyrinogen oxidase
Injury Symptoms
Mostly foliar activity - browning and necrosis of leaf tissue. Reddish brown spotting on
the leaf surface may appear shortly after the herbicide is applied. Susceptable plant
leaves will yellow and then turn brown and die. Plants that do not die may be stunted for
a week or more. COC and other additives, as well as extremely cool or warm temperatures
may increase plant injury.
Mode of Action
Inhibition of protoporphyrinogen oxidase
Injury Symptoms
Mostly foliar activity - browning and necrosis of leaf tissue. Reddish brown spotting on
the leaf surface may appear shortly after the herbicide is applied. Susceptable plant
leaves will yellow and then turn brown and die. Plants that do not die may be stunted for
a week or more. COC and other additives, as well as extremely cool or warm temperatures
may increase plant injury.
Mode of Action
Inhibition of protoporphryinogen oxidase
Injury Symptomology
Soil and foliar activity - browning and necrosis of leaf tissue. Plant leaves will show
interveinal chlorosis and then turn brown and die. Reddish brown spotting on the leaf
surface may appear shortly after the herbicide is applied. Plants that do not die may be
stunted for a week or more. Extremely cool temperatures and/or wet soils may increase
plant injury.
Weed Science Homepage | Herbicide Injury Index | Herbicide Injury Index