MESOTRIONE

Trade name(s) Callisto

Manufacturer(s) Syngenta

Formulation(s) 4 lb/gal suspension concentrate

Remarks Mesotrione is a synthetic relative of natural herbicides produced by the plant Callistemon citrinus. Controls broadleaf weeds in corn.

Water solubility 15,000 ppm

Storage conditions Can be stored as low as 20°F.

Acute toxicity LD50 - greater than 5,000 mg/kg

Action in plant Inhibits HPPD enzymes essential to photosynthesis.

Site of action Group 27: inhibits 4-hydroxyphenylpyruvatedioxygenase (4-HPPD)

Chemical family Triketone

Koc 14 - 390 mL/g

Asparagus

Rick Boydston
Revised March 2014

ASPARAGUS—Seedbeds and Early Establishment

See “Section N. Vegetable Crops: Site Preparation, Stale Seedbeds, and Selective Postemergence Applications” for additional options for weed control during asparagus establishment.

clethodim (several trade names)

Rate 0.07 to 0.12 lb ai/A

Rhubarb

Ed Peachey
Revised March 2014

RHUBARB

glyphosate (many products)

Rate Consult label

Time Broadcast before crop emerges; after crop emerges use hooded and shielded sprayers in row middles, and wiper application in row middles.

Sweet Corn (Fresh, Processing, and Seed)

Ed Peachey
Revised March 2014

CORN, SWEET—Preplant Incorporated and Preemergence Surface

acetochlor (Surpass or Cadence)

Rate 0.8 to 3 lb ai/A. Consult appropriate label for rates.

Time Apply preplant or preemergence.

Cranberries

Kim Patten
Revised March 2014

Preplant weed control All major weed problems can be prevented by starting with a clean field and avoiding re-infestation.

Blueberries, Gooseberries, Currants, and Elderberries

Ed Peachey
Revised March 2014

BLUEBERRIES, GOOSEBERRIES, CURRANTS, AND ELDERBERRIES—Weed and Vegetation Management

Blackberries and Raspberries

Joe DeFrancesco
Revised March 2014

Boysenberry; Loganberry; blackberries (Marion, Evergreen and other cultivars); and red and black raspberries

BLACKBERRIES AND RASPBERRIES—Site Preparation

glyphosate (numerous product names)

Rate Consult labels

Corn (Field, Silage, and Seed Corn)

Paul Marquardt
Revised March 2014

CORN—Herbicide-resistant Corn

Herbicide-resistant field corn is now commonly grown in the Pacific Northwest. There are four major types of herbicide resistant corn: some that are genetically engineered; and some that are developed by genetic selection of tolerant corn individuals and/or varieties. Failure to apply the correct herbicide to the correct crop will result in serious injury to the corn. Refer to the appropriate herbicide label for guidelines on how to use each product on herbicide-resistant corn.

Tall Fescue

Andrew Hulting
Revised September 2013

Note Also see GRASS SEED—New and Established for herbicides that may be used on many species of grass grown for seed.

bromoxynil + pyrasulfotole (Huskie)

Rate 0.185 to 0.205 lb ai/A bromoxynil + 0.033 to 0.036 lb ai/A pyrasulfotole (13.5 to 15 oz/A Huskie)

Kentucky Bluegrass

Andrew Hulting
Revised September 2013

Note Also see GRASS SEED—New and Established for herbicides that may be used on many species of grass grown for seed.

bromoxynil + pyrasulfotole (Huskie)

Rate 0.185 to 0.205 lb ai/A bromoxynil + 0.033 to 0.036 lb ai/A pyrasulfotole (13.5 to 15 oz/A Huskie)

Annual and Perennial Ryegrass

Andrew Hulting
Revised September 2013

Note Also see GRASS SEED—New and Established for herbicides that may be used on many species of grass grown for seed.

bromoxynil + pyrasulfotole (Huskie)

Rate 0.185 to 0.205 lb ai/A bromoxynil + 0.033 to 0.036 lb ai/A pyrasulfotole (13.5 to 15 oz/A Huskie)

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