Mode of Action - K-State Department of Agronomy - Home

74 Pages·2008·4.32 MB·English

Herbicide
Mode of Action
Herbicide Mode of Action
How a herbicide works
Use herbicides more efficiently
Recognize and diagnose injury problems
Herbicide resistance management
Herbicide –Plant Interactions
Absorption
Translocation
Metabolism
Mechanism of Action
Physiological response
Requirements for Herbicide Activity
Contact with the target weed
Absorption into the plant
Accumulation of toxic levels at the site
of action
Herbicide Selectivity
Differential response of plant species
to a herbicide
Selective
Nonselective
Herbicide Selectivity
Application Rate
Herbicide Placement
Spray Retention
Differential Absorption
Differential Translocation
Metabolism
Altered Site of Action (Herbicide Resistance)
Absorption of Soil-Applied
Herbicides
Roots
Shoots
Absorption of Postemergence
Herbicides
Leaf surface coverage
Leaf surface properties
Herbicide-spray properties
Temperature
Humidity
Plant Vigor
Herbicide Metabolism
Chemical transformations of a
herbicide in a plant
Metabolism generally results in
detoxification of a herbicide, but
also can increase the toxicity of a
herbicide
Altered Site of Action
Inability of a herbicide to bind to the
site of action due to a genetic and
conformational difference at the
binding site compared to susceptible
biotypes.
Herbicide Resistance