activated carbon
Oregon and Washington only
Rate 25 lb/A in a 1-inch band (equal to a 300 lb/A broadcast application)
Time At planting.
Remarks Apply to smooth, crop residue-free seedbeds. A spray unit on a 12-inch drill applying a slurry band 1 inch wide directly over the seeded row works well. Use proper agitation to keep the carbon in suspension. Mix activated carbon with water at 0.5 lb/gal. Follow carbon application with herbicide application (see entries immediately below).
diuron (several trade names)
Oregon and Washington only
Rate 2 to 2.4 lb ai/A (2.5 to 3 lb/A of an 80DF formulation)
Time Apply after planting but before rain or irrigation.
Remarks Oregon and Washington registrations. Not registered in Idaho. Broadcast immediately after planting and banding with activated carbon. Use lower rate in sandy soils. At least 1 inch of moisture is required within 2 weeks after applying diuron to activate herbicide and move it into the soil profile. Diuron is not strongly photodegraded, but losses can be significant if diuron remains on the soil surface for several weeks without significant moisture during hot and dry planting conditions.
Caution Do not use this system in grass seed rotations that will be replanted to any crop within 2 years because these rotational crops may be injured. Diuron will not control volunteer winter cereals, wild oat, or downy brome.
Site of action Group 7: photosystem II inhibitor
Chemical family Substituted urea
pronamide (Kerb SC)
Oregon only
Rate 0.125 to 0.25 lb ai/A (5.0 to 10.0 oz/A Kerb SC)
Time Apply in a tank-mix with a reduced rate of diuron after the carbon band seeding operation. Application must be made before the seeded crop emerges, and before rain dissipates the carbon band.
Remarks Apply only to fields with well-prepared, firmly packed seedbeds. An adequate carbon band that will absorb the applied herbicide must be present at time of treatment.
Caution A restricted-use herbicide. Do not apply pronamide to sandy or gravely areas in the field. Grower assumes all risks of crop injury or stand loss under unforeseen, adverse environmental conditions, if seedbeds are poorly prepared, or if carbon bands are inadequate at treatment. Do not graze treated fields within 180 days of application; see label for other restrictions and precautions.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Benzamide
rimsulfuron (Matrix SG)
Oregon and Washington only
Rate 0.047 lb ai/A (3.0 oz/A of Matrix SG)
Time Apply after planting but before rain or irrigation.
Remarks Oregon and Washington registrations. Not registered in Idaho. Broadcast immediately (within 5 days) after planting and banding with activated carbon.
Caution See Matrix SG for use precautions and use restrictions. Do not apply to established grass seed stands or unacceptable crop injury will result.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
indaziflam (Alion Herbicide)
Rate 0.0125 lb ai/A (1.0 oz/A of Alion)
Time Apply after planting but before rain or irrigation.
Remarks Broadcast immediately after planting and banding with activated carbon. Apply only to a well-prepared and firmly packed seedbed.
Caution See Alion label for use precautions and use restrictions. Use Alion only once (either at carbon-planting or once in an established stand) to minimize risk of herbicide carryover to subsequent rotational crops.
Site of action Group 29: inhibition of cellulose biosynthesis
Chemical family Fluoroalkyltriazine
EPTC ( Eptam 7 EC Selective Herbicide)
Rate 3.01 to 4.38 lb ai/A (3.5 to 5.0 pints/A of Eptam)
Time There are two ways to utilize Eptam in a carbon-seeding system. Apply after planting but immediately before rain or irrigation OR apply broadcast preplant 3 to 4 weeks prior to carbon-seeding of grasses. Broadcast preplant application may be mechanically incorporated to reduce losses from volatilization.
Remarks Rainfall or irrigation in the amount of 0.25 to 0.5 inches within 7 days of application is needed to activate the herbicide. Apply only to a well-prepared and firmly packed seedbed when applying immediately following carbon-seeding.
Caution See Eptam label for use precautions and use restrictions. Use Eptam only once during the growing season.
Site of action Group 8: inhibitor of lipid synthesis; not ACCase inhibition
Chemical family Thiocarbamate
pyroxasulfone + flumioxazin ( Fierce EZ Herbicide)
Rate 0.032 lb ai/A of flumioxazin + 0.040 lb ai/A of pyroxasulfone (3.0 oz/A of Fierce EZ)
Time Broadcast immediately after planting and banding with activated carbon. Apply only to a well-prepared and firmly packed seedbed.
Remarks Rainfall or irrigation in the amount of 0.5 inches within 7 to 14 days of application is needed to activate the herbicide. Apply only to a well-prepared and firmly packed seedbed.
Caution See Fierce EZ label for use precautions and use restrictions. Use Fierce EZ only once during the growing season.
Site of action (flumioxazin) Group 14: protoporphyrinogen oxidase (PPO) inhibitor, (pyroxasulfone) Group 15: inhibits very long chain fatty acid synthesis
Chemical family (flumioxazin) Dicarboximide; (pyroxasulfone) Isoxazoline