University of Missouri Extension

IPM1007, Revised November 2009

Practical Weed Science for the Field Scout: Corn and Soybean

Seedling growth inhibitors

Trifluralin injury. Notice the purple color, rolled up leaves as if drought stressed, and short, thick lateral root system.Trifluralin injury. Notice the purple color, rolled up leaves as if drought stressed, and short, thick lateral root system. Trifluralin injury. Notice the purple color, rolled up leaves as if drought stressed, and short, thick lateral root system.
 

Short swollen stem caused by trifluralin.
Short swollen stem caused by pendimethalin.Short swollen stem caused by trifluralin, above, and pendimethalin, left.
 

Pendimethalin cannot be used in preplant incorporated applications in corn because of the potential for severe root injury. Planting corn too shallow and followed by preemergence pendimethalin can also cause root clubbing and injury.
Pendimethalin cannot be used in preplant incorporated applications in corn because of the potential for severe root injury. Planting corn too shallow and followed by preemergence pendimethalin can also cause root clubbing and injury.
Pendimethalin cannot be used in preplant incorporated applications in corn because of the potential for severe root injury. Planting corn too shallow and followed by preemergence pendimethalin can also cause root clubbing and injury.Pendimethalin cannot be used in preplant incorporated applications in corn because of the potential for severe root injury. Planting corn too shallow and followed by preemergence pendimethalin can also cause root clubbing and injury.
 

Dinitroanilines chemical group

Herbicides

Mode of action and characteristics of activity

General symptoms

Injury from acetanilides/chloroacetamides and oxyacetamides on corn appears as buggy whipping or improper leaf unfurling.
Injury from acetanilides/chloroacetamides and oxyacetamides on corn appears as buggy whipping or improper leaf unfurling. Injury from acetanilides/chloroacetamides and oxyacetamides on corn appears as buggy whipping or improper leaf unfurling.
Injury from acetanilides/chloroacetamides and oxyacetamides on corn appears as "buggy whipping" or improper leaf unfurling.

Injury from preemergence applications of chloroacetamide/acetanilide and oxyacetamide herbicides appears as heart-shaped leaves or irregular crinkling and cupping of leaves.
Injury from preemergence applications of chloroacetamide/acetanilide and oxyacetamide herbicides appears as heart-shaped leaves or irregular crinkling and cupping of leaves.Injury from preemergence applications of chloroacetamide/acetanilide and oxyacetamide herbicides appears as heart-shaped leaves or irregular crinkling and cupping of leaves.
 

Injury from postemergence applications of chloroacetamide/acetanilide and oxyacetamide herbicides also appears as irregular cupping and sometimes strapping of soybean leaves. Injury is more likely with late applications.
Injury from postemergence applications of chloroacetamide/acetanilide and oxyacetamide herbicides also appears as irregular cupping and sometimes strapping of soybean leaves. Injury is more likely with late applications.Injury from postemergence applications of chloroacetamide/acetanilide and oxyacetamide herbicides also appears as irregular cupping and sometimes strapping of soybean leaves. Injury is more likely with late applications.
 

Chloroacetamides, oxyacetamides chemical group

Herbicides

Mode of action and characteristics of activity

General symptoms

IPM1007, revised November 2009

IPM1007 Practical Weed Science for the Field Scout: Corn and Soybean | University of Missouri Extension

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