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 2015

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 2015

RHUBARB—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 2015

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 2015

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

Blueberries, Gooseberries, Currants, and Elderberries

Joe DeFrancesco and Ed Peachey
Revised March 2015

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

Mulches contribute significantly to weed control if constructed and maintained properly. Even without the benefit of weed control, blueberries grow well under mulch because they are shallow rooted and lacking root hairs. A layer of mulch over the soil conserves soil moisture for blueberries.

Blackberries and Raspberries

Joe DeFrancesco
Revised March 2015

BLACKBERRIES AND RASPBERRIES—Site Preparation

glyphosate (numerous product names)

Rate Consult labels

Remarks Apply to weeds at least 10 days before planting crop. Use highest rate on field bindweed. Do not apply if weeds are stressed by drought, weather, or maturity. Rain within 6 hours after application may reduce effectiveness. Inhibits production of three amino acids and protein synthesis.

Corn (Field, Silage, and Seed Corn)

Joel Felix
Revised March 2015

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 March 2015

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 March 2015

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 2015

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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