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Herbicide Mode of Action Celestine Duncan Weed Management Services Mode of Action Sequence of events from absorption into the plant until the plant dies Classification: 1) Plant Growth Regulators 2) Amino Acid Biosysthesis Inhibitors 3) Photosynthesis Inhibitors 4) Growth Inhibitors 5) Pigment Inhibitors 6) Grass Specific herbicides 7) Membrane Disrupters How many MOA are represented in this list of herbicides? • • • • • • • Tordon 22K Transline Curtail Banvel (Clarity) Garlon 2,4-D Redeem ? Range and Pasture Herbicide MOA • Plant Growth Regulators • Amino Acid Biosynthesis Inhibitors Plant Growth Regulators (PGR) Referred to as synthetic auxins (regulate growth in plant tissues) Accumulation at growing points Specific biochemical change responsible for killing plant is not known (probably several processes) Grasses are not susceptible (may be due to differences in vascular tissue structure or differences in translocation or metabolism) Common Leaf Symptoms from PGR Exposure normal cupped and blistered from PGR exposure Foliar PGR Application short internode accumulation In new growth Root Absorption of Plant Growth Regulator Herbicides translocation to growing point swollen hypocotyl callus formation on roots lack of root development Amino Acid Inhibitors (Glyphosate, Escort, Plateau) Prevent synthesis of certain amino acids produced by plants but not animals. Translocates to shoot and root new growth Plants stop growing shortly after application Plant death may be slow (10 days+) Plateau or Escort Injury Symptoms Stunting Chlorosis of youngest tissue Glyphosate (Roundup) Drift chlorosis stem proliferation shortened internodes