Dual Magnum Herbicide

Dual Magnum Herbicide
Dual Magnum Herbicide

Buy 2 or more: $305.93 each

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Product Overview

Dual Magnum Herbicide is a highly effective herbicide that controls most annual grasses and broadleaf weeds. Contains an active ingredient that is known for controlling grass and weeds in corn, peanuts, soybeans, and cotton. It may be applied as preemergence, postemergence treatment, pre-plant surface-applied, or pre-plant incorporated treatment. Dual Magnum Herbicide is uniquely formulated as an emulsifiable concentrate to easily apply and to provide convenience to users. It may be applied to corn, tomatoes, soybeans, sunflowers, peas, peanuts, cotton, potatoes, sugar beets, lupines, tall fescues, and other crops. If used as a preemergence treatment, apply during planting or right after planting. Can be tank mixed with other registered herbicides.

Features and Specs

Active Ingredient S-metolachlor 83.7%
Target pests Orchardgrass, Foxtails, Fescue fine, Purslane, Red rice, Downy brome, Fescue tall, Carpetweed, Bentgrass, Barnyardgrass, Carpetweed, Crowfootgrass, Panicum fall, Shattercane, Witchgrass
For use in Beans, Soybeans, Sugar Beets, Sunflowers, Tomatoes, Lentils, Cotton, Peas, Peanuts, Bentgrass, Corn, silage, Kentucky bluegrass, Perennial ryegrass, Potatoes, Rhubarb, Safflower
Pet safe Yes, if used as directed on Label
Formulation Professional Product
Group 15 Herbicide
NY (Restricted to Commercial Applicators Only)
Special Features Can be applied as a pre-plant surface-applied, pre-plant incorporated, preemergence, or postemergence treatment for control of most annual grasses and certain broadleaf weeds.
Shipping Weight 24.21 lbs
Manufacturer Syngenta
EPA Registration 100-816



Dual Magnum is taken up by the shoots and/or roots of emerging weeds. This uptake results in the inhibition of shoot and root tissue growth soon after weed germination. Because of this, Dual Magnum will not control emerged weeds. Control weeds that are present by another means, e.g., mechanical means or by another herbicide.

If Dual Magnum is incorporated, do not exceed a 2-3 inch depth. Any tillage after the Dual Magnum incorporation and before planting may not exceed 2-3 inches or the depth of incorporation.

Dry weather following application of Dual Magnum may reduce weed control. Cultivate if weeds develop.

Where reference is made to weeds partially controlled, partial control can either mean erratic control from good to poor, or consistent control at a level below that generally considered acceptable for commercial weed control. Control of these weeds can be erratic, due partially to variable weather conditions. The following procedures may improve the control of weeds listed as partially controlled in Table 1:

  • Thoroughly till soil to destroy germinating and emerged weeds.
  • Plant crop into moist soil immediately after tillage. If Dual Magnum is to be used preemergence, apply at planting or immediately after planting.

  • If available, sprinkler irrigates within 2 days after application. Apply 1/2-1 inch of water. Use lower water volume (1/2inch) on coarse-textured soils and higher volume (1 inch) on fine-textured soils. Also, refer to the section on Center Pivot Irrigation Application for this method of applying Dual Magnum.

  • If irrigation is not possible and rain does not occur within 2 days after planting and application, weed control may be decreased. Under these conditions, make a uniform, shallow cultivation as soon as weeds emerge.

Weeds Controlled or Partially Controlled by Dual Magnum Applied Prior to Weed Emergence

  • Barnyardgrass
  • Crabgrass, large
  • Crabgrass, smooth
  • Crowfootgrass
  • Cupgrass, Prairie
  • Cupgrass, Southwestern
  • Cupgrass, woolly
  • Foxtail, bristly
  • Foxtail, giant
  • Foxtail, green
  • Foxtail, millet
  • Foxtail, yellow
  • Goosegrass
  • Johnsongrass (seedling)
  • Millet, wild-proso
  • Panicum, fall
  • Panicum, Texas
  • Rice, red
  • Sandbur, field
  • Ryegrass, Italian
  • Sandbur, Southern
  • Shattercane
  • Signalgrass, broadleaf
  • Sorghum (volunteer)
  • Witchgrass

*See label for the complete list of weeds controlled.

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Questions & Answers

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Will Dual Magnum Herbicide control nut grass ?

Dual Magnum Herbicide is not labeled for nut grass. Sedgehammer would be a good choice if you are looking for a post emergent product for nut grass. 

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4 of 4 people found this answer helpful

Can I buy Dual Magnum Herbicide in a smaller amount?

Dual Magnum Herbicide is only available in a 2.5 gallon jug at this time.

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4 of 5 people found this answer helpful

Can Dual Magnum Herbicide be used on conventional corn?

The product label for Dual Magnum Herbicide states it can be used to control most annual grasses and certain broadleaf weeds in all types of corn. 

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1 of 1 people found this answer helpful

Es Dual Magnum Herbicide bueno para perejil?

Tengo perejil silantro y menta


No, Dual Magnum Herbicide no está etiquetado para ser usado en hierbas.

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Can Dual Magnum Herbicide be used on a clover plot?

Dual Magnum Herbicide is not labeled for use on clover. Clover can be seeded 9 months after application, per the product label.

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