Forestry Herbicide Symptoms & Mode of Action. John Boyd University of Arkansas [email protected] 501-671-2224. What is mode of action?. How a herbicide disrupts or inhibits normal plant development. Examples cell membrane destruction. block protein synthesis
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Phloem mobile herbicides move up and down in the plant
Contact herbicides do not move in the plant
Xylem mobileherbicides move up in the plant
Affect cell division, cell enlargement, protein synthesis and respiration. Act by upsetting hormone balance.
These herbicides interrupt photosynthesis the process by which green plants convert light energy into food.
Symptoms often appear on the margins of the oldest leaves (pear).
These herbicides cause the green pigments (chlorophyll) in plants to be destroyed. Without chlorophyll, plants cannot photosynthesize and will die.
The root inhibitors interrupt cell division (mitosis) stopping root growth in seedling plants.
Destroy cell membranes, causing cell contents to leak out and result in desiccation of plant tissue.
Fast acting herbicides that produce rapid leaf burn.
These herbicides act by disrupting lipid biosynthesis in grass plants. Plant cells and cellular organelles all contain lipid membranes. Therefore, these herbicides affect cell membrane integrity in the meristems.
These herbicides inhibit amino acid synthesis which is necessary for the formation of plant proteins.
Compact growth on azalea
Bunched, compact growth on dogwood and sassafrass