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 2016

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 2016

Winter Applications to Dormant Rhubarb

carfentrazone (Aim EC)

Rate Up to 0.031 lb ai/A (2 fl oz/A Aim EC)

Time After crop emergence, but only to row middles. Use hooded and shielded sprayers.

Sweet Corn (Fresh, Processing, and Seed)

Ed Peachey
Revised March 2016

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 2016

Preplant weed control All major weed problems can be prevented by starting with a clean field and avoiding reinfestation. For proper preplant management, growers should consider spraying perennial weeds with several applications of an appropriate systemic herbicide, using sand free from weed seeds, fumigating soil, planting weed-free vines, cleaning equipment when moving between beds, and seeding dikes with cover crops effective in preventing weed infestation (e.g., dwarf perennial ryegrasses and some creeping fescues).

Blueberries, Gooseberries, Currants, and Elderberries

Joe DeFrancesco and Ed Peachey
Revised March 2016

Weed Control Efficacy Ratings For information on weed control efficacy of products listed in this article, see the publication “Pest Management Strategic Plan for Blueberries in Oregon and Washington” (DeFrancesco and Murray, 2011): http://www.ipmcenters.org/pmsp/pdf/ORWABlueberry.pdf

Blackberries and Raspberries

Joe DeFrancesco
Revised March 2016

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

Site Preparation

glyphosate (numerous product names)

Rate Consult labels

Corn (Field, Silage, and Seed Corn)

Joel Felix
Revised March 2016

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 March 2016

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-West of the Cascades

Andrew Hulting
Revised March 2016

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 March 2016

Annual and Perennial Ryegrass

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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