Preplant and Preemergence

clomazone (Command 3ME)

Rate 0.5 lb ai/a (1.3 pints/a Command 3E). Use lower rate on coarse soils and the higher rate on fine soils.

Time After planting and before weed emergence.

Remarks A microencapsulated (ME) formulation is registered for use. This formulation is designed to minimize drift and injury to adjacent fields and sites.

Caution Clomazone has a residual or carryover of up to 16 months that severely restricts crop rotations in the Pacific Northwest. Refer to label for rotation crops before applying. Crops on sandy soils in other regions have been injured. Allow 300 ft between the application site and desirable crops. Do not apply upwind of sensitive crops such as berries and ornamentals. One application per year.

Site of action Group 13: inhibits DOXP synthase

Chemical family Isoxazolidinone

linuron (Lorox DF50)

Rate 0.5 to 1 lb ai/a (1 to 2 lb/a Lorox) depending on soil texture and OM content

Time Preemergence or up to 30 days before planting

Remarks Make only a single preemergence application of Lorox DF per season and do not exceed 2 lb of Lorox DF in any application. Lorox must be activated within 2 weeks of application for optimum control with rain or irrigation of 0.5 inch or more. Tankmix with other herbicides such S-metolachlor to broaden spectrum. Add a surfactant if burndown of emerged weeds is required, but do not apply over the top of emerged edamame seedlings.

Caution Do not exceed 2 lb of Lorox DF in any application. Soybeans planted too shallow have increased potential for injury. Do not feed treated forage to livestock.

Site of action Group 7: photosystem II inhibitor

Chemical family Urea

fomesafen (Reflex)

Oregon only

Rate 0.25 to 0.375 lb ai/a (1 to 1.5 pints/a Reflex) depending on soil type

Time Preplant, postplant surface, or postemergence (at least one fully expanded trifoliate leaf)

Remarks Must be activated with rainfall or irrigation of 0.5 inch or more and before weed seeds germinate for best efficacy. Treated soil that is splashed onto newly emerged seedlings may result in temporary crop injury, but plants normally outgrow these effects and develop normally. Proper activation of herbicide before seedlings emerge will minimize risk of injury. Preharvest interval is 32 days.

Caution Snap beans, squash, and potatoes can be planted immediately after application. Wheat and other cereals can be planted 4 months after application; sweet corn 10 months after application. Beets, Brassica crops, and all other crops not listed on the label cannot be planted until 18 months after application.

Site of action Group 14: protoporphyrinogen oxidase (PPO) inhibitor

Chemical family Diphenylether

pendimethalin (Satellite HydroCap)

Rate 0.71 to 1.43 lb ai/a (1.5 to 3.0 pints/a) depending on application method, soil type, and soil OM content.

Time Preplant surface: apply within 15 days of planting. Preplant incorporated: apply within 60 days of planting and incorporate. Preemergence: apply at planting or up to 2 days after planting.

Remarks Apply only by ground. Apply to a firm seedbed, free of clods if applying preemergence.

Caution Do not apply within 85 days of harvest and do not exceed one application per crop season at the highest rate per acre for any given soil type and application method.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

S-metolachlor (Dual Magnum)

Rate 0.98 to 1.95 lb ai/a (1 to 2.0 pints/a) depending on soil texture and soil organic matter.

Recommended Dual Magnum rates (pints/a)

Soil texture

Soil OM












Timing and Application Methods Preemergence: Apply during (behind planter) or after planting but before weeds or crops emerge. Rainfall or irrigation is needed to activate herbicide and maximize efficacy. If water cannot be applied, or rainfall is not expected, preplant incorporate Dual Magnum. Preplant surface (minimum-tillage or no-tillage only): applied up to 45 days before planting. Disturbance in the row during planting will reduce weed control. Preplant incorporated: incorporate uniformly into the top 2 inches of soil within 14 days before planting.

Remarks Do not apply through any irrigation system.

Caution Preharvest interval is 60 days for forage and 120 days for hay. Do not exceed 2 pints/a per year.

Site of action Group 15: inhibits very long chain fatty acid synthesis

Chemical family Chloroacetamide

sulfentrazone (Willowood Sulfentrazone 4SC)

Rate 0.1875 lb ai/a (2.25 to 6 fl. oz./a) depending on soil texture and pH

Time Preemergent

Remarks See label for plantback restrictions. Rotational interval is 18 months for canola and 36 months for sugarbeets.

Caution Do not use on soils with <1% organic matter (sand). Do not incorporate into the soil. Experience lacking with this herbicide in the PNW.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Triazinone

trifluralin (Treflan 4L)

Rate 0.5 to 1 lb ai/a (1 to 2.0 pints/a) depending on soil texture.

Time Apply before planting in spring or fall.

Remarks Cool weather early in growing season may result in reduced stand. Consult label for special restrictions in reduced tillage or no-till systems.

Caution Do not exceed one application (2 pints/a) per year.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline