SULFENTRAZONE

Trade name(s) Spartan, Portfolio, Dismiss

Manufacturer(s) FMC Corp.

Formulation(s) 75% dispersible granule, 4 lb/gal flowable liquid

Remarks Soil-applied, preemergent triazolinone herbicide that can be applied either preplant incorporated or preemergence treatment. Note recropping intervals.

Water solubility 10 ppm at pH 5 and 300 ppm at pH 7

Storage conditions Stable in dry, cool conditions.

Acute toxicity LD50 - 2,416 mg/kg

Action in plant Disrupts cell membranes by inhibiting protoporphyrinogen oxidase (PPO) in the chlorophyll biosynthetic pathway, leading to a buildup of toxic intermediates.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Triazinone

Koc 43 mL/g

Vegetation Control

Tim Prather
Revised March 2012

Total vegetation control with soil-residual herbicides is a process in which the addition of chemicals renders the soil unfit for plant growth. Soil-residual herbicides do not kill all animal and microbiological life in the soil.

Keep the following in mind when using soil-residual herbicides:

Brassica (Cole) Crops

Ed Peachey
Revised March 2014

BRASSICA CROPS—Site Preparation, Stale Seedbeds, and Selective Postemergence Applications

See “Site Preparation”, “Labeled ‘L’ Uses for Glyphosate in Vegetable Crops” (table), and “Registered Uses of Carfentrazone (Aim) Herbicide in Food Crops” (table) at the beginning of Section N. Vegetable Crops in this handbook.

Quick Reference for Herbicides Labeled for Brassica crops1

Strawberries

Joe DeFrancesco
Revised March 2014

Weed control practices in strawberries must be timed to coincide with the crop’s non-reproductive phases, or when minimal herbicide uptake can be expected. Strawberries can be induced into a non-reproductive “summer dormancy” by withholding water and fertilizer after harvest. Beds can be renovated by mowing old leaves, cultivating row middles, and sometimes by applying a herbicide. In mid-August, plants are fertilized and watered to enhance flower bud development. Soil-applied herbicides can be applied at full rates in the fall.

Mint

Rick Boydston
Revised March 2014

MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop

sulfentrazone (Spartan 4F)

Rate 0.14 to 0.375 lb ai/A (4.5 to 12 fl oz/A product)

Chemical Fallow East of the Cascades

Sandy Macnab
Revised March 2014

2,4-D (several products) + glyphosate (several products)

Rate 0.16 to 0.32 lb ae/A 2,4-D + 0.19 to 0.38 lb ae/A glyphosate. Use the higher rate in no-till, or when plants are beyond seedling stage.

Garbanzo Beans (Chickpeas), Cicer arietinum

Drew Lyon
Revised March 2014

Garbanzo beans (chickpeas) are included in EPA designated Crop Group 6C that includes peas and beans. Therefore, labels for dry beans and peas may have special restrictions regarding garbanzo beans.

GARBANZO BEANS—Wild Oat

Preplant or preemergence

triallate (Far-Go or Avadex)

Rate 1.5 lb ai/A (1.5 quarts/A Far-Go, 12.5 to 15 lbs/A Avadex)

Peas (Dry)

Drew Lyon
Revised March 2014

PEAS, DRY—Annual Grass and Broadleaf Weeds

Preplant incorporated

ethalfluralin (Sonalan)

Rate 0.56 to 0.75 lb ai/A (1.5 to 2 pints/A Sonalan HFP)

Time Apply preplant and incorporate by following label instructions.

Turfgrasses

Gwen Stahnke
Revised March 2014

TURFGRASSES—Influence of Cultural Practices on Weed Encroachment

Poor turf culture is a major reason for weedy lawns. Any effort to control weeds in turf should start with improving cultural practices. One goal of cultural weed control is to maximize turf density and maintain healthy, disease-free turf for a major part of every year. Some of the most important cultural practices are discussed below.

Agrichemicals and Their Properties

Ed Peachey, Tim Miller, and Andy Hulting
Revised March 2014

This information provides specifications for users of this handbook. For more information regarding the physiological or biochemical activity and behavior in or on soils, refer to the Herbicide Handbook of the Weed Science Society of America.

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