METOLACLOR (DUAL)

Mode of action: seedling growth inhibition

Specific mode: shoot inhibitor

Chemical family: chloroacetamide (acetanilide)

Uptake: stem primarily and root

Movement: systemic throughout plant

Common application: pre-emergence

Weed control: annual grasses and some annual broadleaves
[For examples, grasses include foxtails, sandbur, crabgrass, fall panicum, and broadleaves include Eastern black nightshade and pigweeds, and partial control of hairy nightshade.]

Weed stage: pre-emerged (germinating seed)

Injury by Metolaclor -- draw string	Injury by Metolaclor -- small leaves

Potato injury: Protein synthesis at the shoot and root tips (meristem cells) is inhibited resulting in poor growth. The first symptom of severe exposure is no emergence of potato sprouts due to stunting of underground shoot. If severely affected plants emerge, the stem will not recover and new stem growth must occur from below ground. With mild exposure, affected leaves have a shortened mid-vein resulting in a "heart-shaped" appearance from the "draw-string" effect. Leaf "crinkling" is usually associated with the draw-string effect. Leaves are often very small and may be downwardly cupped before forming the heart shape. Injury results from post-emergence application or application at cracking followed by rain or irrigation which pushes Dual down the soil crack to the sprout.

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