Department of Botany and Plant Pathology Purdue University West Lafayette, IN 47907 Page 3
This section displays herbicide injury symptoms based on the common name (active ingredient) of the herbicide. You may click on an image to display it in larger detail. Most herbicide products will list the common name under the active ingredient section of the label. A cross reference list of trade names and common names can also be found in Weed Control Guidelines for Indiana WS-16.
Select the "Classified by Mode of Action" link to view the section on herbicide injury symptoms based on the mode of action of the herbicide, e.g. 2,4-D is in the Growth Regulator family.
Click on an image to display it in larger detail.
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Mode: Seedling Growth Inhibitor Herbicide: Ethalfluralin, Pendimethalin, Trifluralin Injury: Clubbed or Swollen Root Tips Condition: Carryover of herbicide due mostly to lack of moisture for breakdown or misapplication; stressed conditions (compaction)
Mode: Seedling Growth Inhibitor Herbicide: Ethalfluralin, Pendimethalin, Trifluralin Injury: Discolored shoot as a result of root injury Condition: Carryover of herbicide due mostly to lack of moisture for breakdown or misapplication; stressed conditions (compaction)
Mode: Seedling Growth Inhibitor Herbicide: Ethalfluralin, Pendimethalin, Trifluralin Injury: Clubbed or Swollen Root Tips; Swollen Hypocotyl Condition: Overapplication of herbicide; stressed conditions (compaction)
Mode: Amino Acid Synthesis Inhibitor Herbicide: Glyphosate Injury: Bleached-white appearance of whorl or patches across leaf Condition: Drift of herbicide; symptom expressed dependent on degree of drift
Mode: Amino Acid Synthesis Inhibitor Herbicide: Imazaquin Injury: Short "Bottle-Brush" Lateral Roots Condition: Carryover of herbicide to corn due mostly to lack of moisture for adequate herbicide breakdown; secondary - very low soil pH, soils high in clay and organic matter content
Mode: Amino Acid Synthesis Inhibitor Herbicide: Imazaquin Injury: Interveinal Chlorosis Condition: Carryover of herbicide to corn due mostly to lack of moisture for adequate herbicide breakdown; secondary - very low soil pH, soils high in clay and organic matter content
Mode: Amino Acid Synthesis Inhibitor Herbicide: Imazaquin Injury: Stunting of Plant Condition: Carryover of herbicide to corn due mostly to lack of moisture for adequate herbicide breakdown; secondary - very low soil pH, soils high in clay and organic matter content
Mode: Amino Acid Synthesis Inhibitor Herbicide: Imazethapyr, Thifensulfuron Injury: Red Leaf Veins Condition: Postemergence application made on days with high temperatures and humidity; misapplication
Mode: Amino Acid Synthesis Inhibitor Herbicide: Nicosulfuron, Primisulfuron Injury: Yellowing of whorl, chlorotic patches across leaf, stunting of shoot; malformed leaves Condition: Postemergence herbicide applied during high temps and humidity, during stressed conditions (drought, compaction, etc.) or following the application of an organo-phosphate soil insecticide
Mode: Amino Acid Synthesis Inhibitor Herbicide: Nicosulfuron, Primisulfuron Injury: Reduction in kernel rows from butt to tip of ear Condition: Late postemergence herbicide applications where most of the corn leaves and whorl intercept the herbicide
Mode: Cell Membrane Disruptor Herbicide: Paraquat Injury: Necrotic spots Condition: Herbicide drift from nearby field, most likely a no-till field where a burndown treatment of paraquat was applied
Mode: Photosynthetic Inhibitor Herbicide: Pyridate Injury: Burning of leaves Condition: Herbicide applied postemergence; misapplication