Department of Botany and Plant Pathology Purdue University West Lafayette, IN 47907 Page 2
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: Amino Acid Synthesis Inhibitor Herbicide: Chlorimuron Injury: Short "Bottle-Brush" Lateral Roots Condition:Carryover of herbicide due mostly to high soil pH (>6.8)
Mode: Amino Acid Synthesis Inhibitor Herbicide: Chlorimuron Injury: Interveinal Chlorosis Condition: Carryover of herbicide due mostly to high soil pH (>6.8)
Mode: Amino Acid Synthesis Inhibitor Herbicide: Chlorimuron Injury: Stunting of Plant Condition: Carryover of herbicide due mostly to high soil pH (>6.8)
Mode: Amino Acid Synthesis Inhibitor Herbicide: Chlorimuron Injury: Red Leaf Veins Condition: Postemergence application made on days with high temperatures and humidity; misapplication
Mode: Amino Acid Synthesis Inhibitor Herbicide: Chlorimuron Injury: Reduced Root System Condition: An extended period of wet conditions following a soil application of the herbicide and planting of the crop
Mode: Growing Point Disintegrator Herbicide: Fenoxaprop, Fluazifop, Quizalofop, Sethoxydim, Clethodim Injury: Bleached-white to translucent appearance of whorl or patches across leaf Condition: Drift of herbicide
Mode: Growing Point Disintegrator Herbicide: Fenoxaprop, Fluazifop, Quizalofop, Sethoxydim, Clethodim Injury: Rotten growing point, death of plant Condition: High degree of herbicide drift, misapplication
Mode: Growing Point Disintegrator Herbicide: Quizalofop Injury: White/Bleached spots on leaves Condition: A solvent in the Assure II formulation may cause this symptom when Assure II is applied at high rates
Mode: Amino Acid Synthesis Inhibitor Herbicide: Flumetsulam Injury: Stunting of shoot; interveinal chlorosis; red-purple midrib; reduced root system Condition: Herbicide applied to corn under environmental stress and/or to soils with a very high pH
Mode: Cell Membrane Disruptor Herbicide: Flumiclorac Injury: Burning, speckling of leaves Condition: Herbicide applied postemergence on days with high temperatures and humidity; misapplication
Mode: Pigment Inhibitor Herbicide: Clomazone Injury: Young corn plant may be entirely white; lower leaves bleached-white with these white areas sometimes highlighted with pink Condition: Carryover of herbicide due mostly to lack of moisture for breakdown; misapplication; drift
Mode: Photosynthetic Inhibitor Herbicide: Cyanazine Injury: Lower leaves display burning of tip to base of leaf and outer edges toward center of leaf Condition: Herbicide applied to sandy soils and/or soils with high pH; stressed conditions (warm, sunny weather following prolonged cool, wet weather)
Mode: Growth Regulator Herbicide: 2,4-D or Dicamba Injury: Fused Brace Root Condition: Late application of herbicide where most of corn leaves and whorl intercept the herbicide; misapplication
Mode: Growth Regulator Herbicide: 2,4-D or Dicamba Injury: Rolled "buggy-whip" Whorl Condition: Late application of herbicide where most of corn leaves and whorl intercept the herbicide; misapplication
Mode: Growth Regulator Herbicide: Dicamba Injury: Leaf Cupping Condition: Dicamba drift from nearby field, roadside or other area where herbicide was applied; spray tank contamination