Herbicide Injury Symptomology: Lipid Synthesis Inhibitor Injury

Aryloxyphenoxypropionates and Cyclohexanediones

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Aryloxyphenoxypropionates

Trade Names and Uses:

• Assure (Quizalofop)
  -soybeans
• Fusilade (Fluazifop)
  -soybeans
• Fusion (Fluazifop)
  -soybeans
• Hoelon (Diclofop)
  -small grains
• Option (Fenoxaprop)
  -soybeans
• Whip (Fenoxaprop)
  -soybeans

Mode of Action: Inhibition of acetyl CoA carboxylase enzyme.

Injury Symptoms: Foliar activity - reddening of leaves and stems necrotic at nodes. Injury is seen in grasses only. Newer leaf tissue will be yellow (chlorotic) or brown (necrotic) and the leaves in the leaf whorl can be easily separated from the rest of the plant. Growing point turns yellow, brown and dies. Occasionally chlorotic or necrotic spots are present on soybean leaves, believed to be caused by surfactants and/or emulsifiers in the formulation.

Cyclohexanediones

Trade Names and Uses:

• Poast/Poast Plus (Sethoxydim)
  -soybeans, alfalfa
• Select (Clethodim)
  -soybeans, alfalfa

Mode of Action: Inhibition of acetyl CoA carboxylase enzyme.

Injury Symptoms: Foliar activity - reddening of leaves and stems necrotic at nodes. Injury is seen in grasses only. Newer leaf tissue will be yellow (chlorotic) or brown (necrotic) and the leaves in the leaf whorl can be easily separated from the rest of the plant. Growing point turns yellow, brown and dies. Occasionally chlorotic or necrotic spots are present on soybean leaves, believed to be caused by surfactants and/or emulsifiers in the formulation.

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