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Weed Control Update For Grain Crops

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Extension Weed Science. Plant & Soil Sciences. University of Kentucky. CORN HERBICIDE UPDATE ... Mostly broadleaf weeds. Synchrony XP (chlorimuron thifensulfuron) ... – PowerPoint PPT presentation

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Title: Weed Control Update For Grain Crops


1
Weed Control UpdateFor Grain Crops
  • J. R. Martin J. D. Green
  • Extension Weed Science
  • Plant Soil Sciences
  • University of Kentucky

2
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)

3
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 _at_ 2 pt
  • Touchdown Hi-Tech _at_ 1.2 pt
  • (NK603 event)
  • Broadcast through V8 / 30
  • Max single rate 1.13 lb ae/A
  • Roundup Orginal _at_ 3 pt
  • Roundup WeatherMAX _at_ 2 pt
  • Drop nozzles 30 to 48

4
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

5
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)

6
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

7
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

Source UK AGR-6
8
(No Transcript)
9
Corn Tassel Ear Seed Set
SOURCE Herbek / Martin / Green 2005
10
HERBICIDE RESISTANT WEEDS IN KY
  • Smooth Pigweed Confirmed
  • 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)

11
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)
12
Types of Formulations of Glyphosate
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