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Weed Control Update For Grain Crops. J. R. Martin & J. D. Green Extension Weed Science Plant & Soil Sciences University of Kentucky. CORN HERBICIDE UPDATE. Callisto 4 SC (mesotrione) Approved for sweet corn Camix 3.67L (S-metolachlor + mesotrione) Atrazine sensitive watersheds

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Weed Control Update For Grain Crops

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Weed control update for grain crops l.jpg

Weed Control UpdateFor Grain Crops

J. R. Martin & J. D. Green

Extension Weed Science

Plant & Soil Sciences

University of Kentucky


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CORN HERBICIDE UPDATE

  • Callisto 4 SC (mesotrione)

    • Approved for sweet corn

  • Camix 3.67L(S-metolachlor + mesotrione)

    • Atrazine sensitive watersheds

  • Radius 4L(flufenacet + isoxaflutole)

    • Similar to Equip 32DG

  • Resolve 25DF (rimsulfuron)

    • Pre or Post up to 12” 5 collars

  • Gramoxone Inteon 2L(paraquat)

    • Gramoxone Inteon (2 lb/gal)

    • Gramoxone Max (3 lb/gal)


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SOURCES OF TOLERANCE FOR RR-Corn

Roundup Ready

Roundup Ready 2

(GA21 event)

  • Broadcast through V8 /30”

  • Max single rate 0.75 lb ae/A

    • Roundup Original @ 2 pt

    • Touchdown Hi-Tech @ 1.2 pt

  • (NK603 event)

  • Broadcast through V8 / 30”

  • Max single rate 1.13 lb ae/A

    • Roundup Orginal @ 3 pt

    • Roundup WeatherMAX @ 2 pt

  • Drop nozzles 30” to 48”


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GRAIN SORGHUM HERBICIDE UPDATE

  • Sequence 5.25L(glyphosate + S-metolachlor)

    • Burndown treatment

  • Gramoxone Inteon 2L(paraquat)

    • Gramoxone Inteon 2lb/gal vs Gramoxone Max 3lb/gal


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SOYBEAN HERBICIDE UPDATE

  • Canopy EX(chlorimuron + tribenuron)

    • Fall / Spr burndown (no later than 45 days before planting)

    • Need to include 2,4-D

    • Mostly broadleaf weeds

  • Synchrony XP(chlorimuron + thifensulfuron)

    • Synchrony XP 28.4DF vs Synchrony STS 42DF

    • Post & Early Preplant

  • Sequence 5.25L(glyphosate + S-metolachlor)

    • Burndown + Post (up to 3rd trifoliate)

  • Gramoxone Inteon 2L(paraquat)

    • Gramoxone Inteon (2 lb/gal) vs Gramoxone Max (3lb/gal)


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FALL APPLICATIONS FOR CORN

  • BENEFITS

  • May eliminate spring burndown.

  • Limits weedy vegetation at planting.

  • Help soils warm & dry sooner (usually).

  • Spreads work load.

  • Helps Manage SCN?

  • DRAWBACKS

  • Risk of soil erosion.

  • May require advanced commitment to a crop.

  • Cannot rely on residual activity into next season.

  • May not eliminate spring burndown


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Rating = 0

Atrazine

Glyphosate (RR-corn)

Liberty (LL-corn)

Rating = 1

Buctril

Expert

ReadyMaster ATZ

Rating = 2

Callisto - Hornet

Dicamba - Marksman

Distinct - Option

Equip - Permit

Rating = 3

Accent - 2,4-D

Accent Gold - Exceed

Aim - Lightning

Basis Gold - Spirit

Beacon - Steadfast

Celebrity Plus - Steadfast ATZ

CORN RESPONSE POTENTIAL INJURY RATING (0-3 scale)

Source: UK AGR-6


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Non-treated Check

Lightning Treated

Corn Tassel & Ear Seed Set

SOURCE: Herbek / Martin / Green 2005


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HERBICIDE RESISTANT WEEDS IN KY

  • Smooth PigweedConfirmed

    • Photosystem II inhibitor (1987)

    • ALS inhibitors (1992)

    • Photosystem II + ALS inhibitors (2000)

  • Johnsongrass

    • ACCase inhibitors (1991)

  • Marestail / Horseweed

    • EPSP inhibitor (2002)

  • Italian Ryegrass

    • ACCase inhibitors (2004)


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Glyphosate Resistant Weeds

WEED

LOCATION

* Palmer AmaranthGeorgia

Buckhorn Plantain S. Africa

  • Common Ragweed Missouri

    Goosegrass Malaysia

    Hairy Fleabane S. Africa & Spain

  • Marestail USA (10 states)

    Italian ryegrass S. America

  • Rigid Ryegrass Australia, S Africa, California

* Found in US

(Source: Int. Survey of Herbicide Resistant Weeds)


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Types of Formulations of Glyphosate


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