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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

Weed Control UpdateFor Grain Crops

J. R. Martin & J. D. Green

Extension Weed Science

Plant & Soil Sciences

University of Kentucky

corn herbicide update
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)
slide3

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”
grain sorghum herbicide update
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
soybean herbicide update
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)
slide6

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
corn response potential injury rating 0 3 scale
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

corn tassel ear seed set

Non-treated Check

Lightning Treated

Corn Tassel & Ear Seed Set

SOURCE: Herbek / Martin / Green 2005

herbicide resistant weeds in ky
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)
glyphosate resistant weeds
Glyphosate Resistant Weeds

WEED

LOCATION

* Palmer Amaranth Georgia

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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