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Weed Control Update For Grain Crops

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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  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 @ 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”

  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. 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

  8. Non-treated Check Lightning Treated Corn Tassel & Ear Seed Set SOURCE: Herbek / Martin / Green 2005

  9. 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)

  10. 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)

  11. Types of Formulations of Glyphosate

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