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Herbicide Injury Symptoms
on
Corn and Soybeans


Department of Botany and Plant Pathology
Purdue University
West Lafayette, IN 47907



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This web page address is:
http://www.btny.purdue.edu/Extension/Weeds/HerbInj2/InjuryHerb2.html


Classified by Herbicide Active Ingredient

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.


Classified by Mode of Action

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.


Herbicide Active Ingredient Index:

2,4-D | 2,4-DB | Acetochlor | Acifluorfen | Alachlor | Atrazine | Bromoxynil | Butylate
Chlorimuron | Clethodim | Clomazone | Cyanazine | Dicamba | Dimethenamid | EPTC
Ethalfluralin | Fenoxaprop | Fluazifop | Flumetsulam | Flumiclorac | Fomesafen | Glyphosate
Halosulfuron | Imazaquin | Imazethapyr | Lactofen | Metolachlor | Metribuzin | Nicosulfuron
Paraquat | Pendimethalin | Primisulfuron | Prosulfuron | Pyridate | Quizalofop | Rimsulfuron
Sethoxydim | Thifensulfuron | Trifluralin



Chlorimuron

Mode of Action: Amino Acid Synthesis Inhibitor

Click on an image to display it in larger detail.

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Corn Image

CORN

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)

Corn Image

CORN

Mode: Amino Acid Synthesis Inhibitor
Herbicide: Chlorimuron
Injury: Interveinal Chlorosis

Condition: Carryover of herbicide due mostly to high soil pH (>6.8)

Corn Image

CORN

Mode: Amino Acid Synthesis Inhibitor
Herbicide: Chlorimuron
Injury: Stunting of Plant

Condition: Carryover of herbicide due mostly to high soil pH (>6.8)

Soybean Image

SOYBEAN

Mode: Amino Acid Synthesis Inhibitor
Herbicide: Chlorimuron
Injury: Red Leaf Veins

Condition: Postemergence application made on days with high temperatures and humidity; misapplication

Corn Image

SOYBEAN

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

Clethodim, Fenoxaprop, Fluazifop, Quizalofop, or Sethoxydim

Mode of Action: Growing Point Disintegrator

Click on an image to display it in larger detail.

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Corn Image

CORN

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

Corn Image

CORN

Mode: Growing Point Disintegrator
Herbicide: Fenoxaprop, Fluazifop, Quizalofop, Sethoxydim, Clethodim
Injury: Rotten growing point, death of plant

Condition: High degree of herbicide drift, misapplication

Soybean Image

SOYBEAN

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

Flumetsulam

Mode of Action: Amino Acid Synthesis Inhibitor

Click on an image to display it in larger detail.

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Corn Image

CORN

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

Flumiclorac

Mode of Action: Cell Membrane Disruptor

Click on an image to display it in larger detail.

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Corn Image

CORN

Mode: Cell Membrane Disruptor
Herbicide: Flumiclorac
Injury: Burning, speckling of leaves

Condition: Herbicide applied postemergence on days with high temperatures and humidity; misapplication

Clomazone

Mode of Action: Pigment Inhibitor

Click on an image to display it in larger detail.

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Corn Image

CORN

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

Cyanazine

Mode of Action: Photosynthetic Inhibitor

Click on an image to display it in larger detail.

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Corn Image

CORN

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)

Dicamba

Mode of Action: Growth Regulator

Click on an image to display it in larger detail.

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Corn Image

CORN

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

Corn Image

CORN

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

Soybean Image

SOYBEAN

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

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