Department of Botany and Plant Pathology Purdue University West Lafayette, IN 47907 Page 1
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: 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: 2,4-D Injury: Leaf Strapping Condition: 2,4-D drift from nearby field, roadside or other area where herbicide was applied; spray tank contamination
Mode: Growth Regulator Herbicide: 2,4-DB Injury: Callusing on the stem Condition: Herbicide applied postemergence; misapplication
Mode: Seedling Growth Inhibitor Herbicide: Alachlor, Metolachlor, Acetochlor, Dimethenamid Injury: Corn leafing-out underground, improper leaf unfurling Condition: Misapplication - herbicide rate too high for soil type; stressed conditions (cool, wet soils) where corn is slowly growing
Mode: Seedling Growth Inhibitor Herbicide: Alachlor, Metolachlor, Acetochlor, Dimethenamid Injury: Leaf Malformation Condition: Overapplication of herbicide
Mode: Cell Membrane Disruptor Herbicide: Acifluorfen, Fomesafen, Lactofen Injury: Bronzing, Speckling of Leaves Condition: Herbicide applied postemergence on days with high temperatures and humidity; misapplication
Mode: Cell Membrane Disruptor Herbicide: Fomesafen Injury: Dead or bleached leaf veins Condition: Carryover of herbicide due mostly to lack of moisture for breakdown; misapplication
Mode: Photosynthetic Inhibitor Herbicide: Atrazine, Metribuzin Injury: Lower leaves display interveinal chlorosis with necrotic margins Condition: Carryover of atrazine or high rate of metribuzin
Mode: Photosynthetic Inhibitor Herbicide: Atrazine, Metribuzin Injury: Lower leaves go from chlorotic to necrotic, fall off of stem, and in severe cases, complete death of plant Condition: Carryover of atrazine or high rate of metribuzin; both herbicides are influenced by high soil pH making the herbicides more available to cause injury; eroded knolls in field are likely areas where injury may occur
Mode: Amino Acid Synthesis Inhibitor Herbicide: Flumetsulam, Halosulfuron, Nicosulfuron, Primisulfuron, Prosulfuron, Rimsulfuron Injury: Stunting of shoot, chlorotic whorl Condition: Herbicide applied postemergence to corn under stress; misapplication
Mode: Photosynthetic Inhibitor Herbicide: Bromoxynil Injury: Burning of leaves Condition: Herbicide applied postemergence on days with high temperatures and humidity; misapplication
Mode: Seedling Growth Inhibitor Herbicide: EPTC, Butylate Injury: Improper leaf unfurling, twisted whorls Condition: Misapplication; heavy rains soon after herbicide application that may leach away the herbicide safener; stressed conditions (cool, wet soils), certain hybrids may be sensitive