WSU Extension

Hortsense

Herbicide Damage
 
2,4-D and triclopyr 
Dicamba 
Dichlobenil (Casoron) 
Fluazifop 
Glyphosate and sulfonylureas 
Horticultural spray oil 
Long-term residual herbicides 
Triazines (atrazine, simazine and others) 



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Caption: Dicamba damage on deodar cedar
Photo by: R. Maleike
  
Herbicide Damage : Dicamba
(revision date: 5/1/2013)


Biology
Dicamba is a hormone-type herbicide that mimics natural growth regulators produced in plants. It is used for control of broadleaf weeds and is readily absorbed by roots and foliage and translocated throughout the plant via both xylem and phloem. Most dicamba damage comes from applications in turf areas made over the root zone of desirable plants. Type and severity of damage is extremely variable and is affected by plant species, stage of growth, amount applied, and watering after application. Symptoms typically appear first on newly developing tissues. Damage on broadleaf plants usually causes upward cupping of leaves. In certain situations, dicamba can kill leaves. On London plane tree, it can damage or kill vertical sections of bark. Dicamba damage to conifers may appear as a slight twisting or distortion of the needles or as a more pronounced distortion. It also can show up as needle death, usually from the base of the needle outwards toward the tip, or as club-shaped swellings on new growth. Dicamba can persist in the soil for most of the growing season or from one growing season to the next.
Management Options

Non-Chemical Management
  • Avoid applications where root uptake or drift can occur on neighboring desirable plants.
Select non-chemical management options as your first choice!

Chemical Management

Carefully read all label instructions prior to using dicamba formulas.

Images

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Caption: Dicamba damage on deodar cedar
Photo by: R. Maleike
Caption: Dicamba damage on Fraser photinia
Photo by: R.S. Byther
Caption: Dicamba damage on birch
Photo by: R. Maleike
Caption: Dicamba damage on European beech
Photo by: R. Maleike
Caption: Dicamba damage on London plane
Photo by: R. Maleike
Caption: Dicamba damage on Austrian pine
Photo by: R. Maleike
Caption: Dicamba damage on Japanese black pine
Photo by: R. Maleike
Caption: Dicamba damage on little-leaf linden
Photo by: R. Maleike
Caption: Dicamba damage on shore pine
Photo by: R. Maleike