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2020 Wheat County Meeting
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2020 Wheat County Meeting
Wheat Weed Control
Research in Progress
Wheat Injury From PRE Herbicides. 2019 (significant rainfall after planting)
2" Radish Response to POST herbicides.
Enlist One - 1 qt/A, XtendiMax - 22 oz//A, Quelex - 1 qt/A
Radish Response to POST herbicides.
Clean at Planting
Controlling Broadleaf Weeds - Radish
MCPA vs 2,4-D
Wild Radish Response to Residual Activity of Wheat Herbicides. 10 DAT
In-Crop Ryegrass Control
Ryegrass Control in Wheat
Proper Timing of POST Materials
ALS resistance - MoA 2, ACCase resistance - MoA 1
Ryegrass planted 0.5 inch with deep turning vs without tillage.
Ryegrass Resistant to ALL POST’S?
Zidua: Effective on Ryegrass
Fierce (Section 24 c GA Label)
Fierce (Section 24 c GA Label) - Application between spike and 2 lf wheat
Ryegrass and Radish
Clean at Planting
Broadleaf Herbicides Labeled
Treated Untreated Wheat 2019/2020 A. Stanley Culpepper University of Georgia Tifton, GA
Wheat Weed Control 1. New topics: Quelex 2. Broadleaf weed control review 3. Ryegrass weed control review
Research in Progress Preplant application “prior to or shortly after planting” 2-lf to flag leaf 0.75 oz/A + Crop Oil
Wheat Injury From PRE Herbicides. 2019 (significant rainfall after planting) Wheat 3-19. 61 a 29 b XtendiMax 11 oz Quelex 0.75 oz MCPA 16 oz
Label: chickweed, geranium, henbit, horseweed, radish, vetch Research: chickweed, gernanium, henbit, small radish Weed Control
2” Radish Response to POST herbicides. Wheat 3-19. 50 DAT. 80 b 95 a XtendiMax 11 oz Quelex 0.75 oz MCPA 16 oz
Enlist One – 1 qt/A XtendiMax – 22 oz//A Quelex– 1 qt/A
Radish Response to POST herbicides. Wheat 4-19. 21 DAT. 80 b 90 a XtendiMax 11 oz Quelex 0.75 oz 87 b 61 b 68 b 91 a XtendiMax 11 oz Quelex 0.75 oz Enlist One 16 oz *MCPA = 2,4-D in control Radish 4-8” Radish 18-24”
Clean at Planting 1. Tillage (before emerge) 2. Roundup (before emerge) 3. Gramoxone (before emerge) 4. Harmony Extra (before emerge or in crop) 5. Quelex (before emerge or in crop) 6. Select 30 d plant back 7. 2,4-D: 24 d plant back 8. Valor: 30 d plant back RYEGRASS: Roundup fb Gramoxone
Controlling Broadleaf Weeds - Radish 1. Harmony Extra fb MCPA or 2,4-D 1. Harmony Extra + MCPA or 2,4-D 2. 2,4-D alone 3. Harmony + Quelex 4. Harmony Extra alone Most effective program Least effective program
CROP RESPONSE: MCPA: 2 tiller to full tiller wheat (safer) 2,4-D: full tiller wheat WEED RESPONSE: Similar on small weeds; 2,4-D often better on larger weeds. No difference when mix w Harmony. MCPA provides best residual radish control. MCPA vs 2,4-D
Wild Radish Response to Residual Activity of Wheat Herbicides. 10 DAT Wheat 2-19. 6 c 71 a XtendiMax 11 oz Quelex 0.75 oz MCPA 16 oz
Ryegrass Control 1. A genetic stud– will develop resistance to ALL herbicides quickly. 2. Extremely competitive with grain production.
In-Crop Ryegrass Control Wheat Zidua Fierce Axiom Hoelon Osprey Axial PowerFlex Barley Hoelon Axial Oat Rye Products with the same color error = same MOA
Non-treated PowerFlex 3X rate or Osprey at 3X rate Non-treated Axial XL 2X rate ALS resistance - MoA 2 ACCase resistance – MoA 1
Ryegrass planted 0.5 inch without tillage. Ryegrass planted 0.5 inch followed by deep turning.
Use of residuals (BASF) (Valent - 24 c) Ryegrass Resistant to ALL POST’S?
Delayed PRE: Wheat seed planted at least 0.75” deep 80% of seed germinated with 0.5” shoot 0.75 to 1 oz (sands); 1 to 1.25 oz (med texture) Zidua: Effective on Ryegrass Early POST (spike through 4-tiller): Seed planted at least 0.5” deep 1 to 2 oz/A Can mix with Axial after 2 leaf wheat
Good ryegrass, radish & other broadleaves! Must walk slowly with injury concerns. Fierce (Section 24 c GA Label)
Fierce (Section 24 c GA Label) Application between spike and 2 lf wheat: Seed planted between 1 and 1.5 inch deep Apply at 1.5 oz/A Do not apply on sands!!!! Do not mix with anything but water!!! MUST BE ACTIVATED PRIOR TO WEEDS ½”
Ryegrass and Radish PowerFlex or Osprey + Harmony Extra Axial followed by MCPA + Harmony Extra Fierce
Summary Great options for broadleaves Using same herbicide MOA on a piece of ground guarantees ryegrass resistance in 3 yr Walk slowly with Fierce and zidua
Clean at Planting (wheat, barley, oats, rye, triticale) 1. Tillage (all crops) 2. Roundup (all crops) 3. Gramoxone (wheat, barley) 4. Select 30 d plant back (all crops) 5. 2,4-D: 24 d plant back (all crops) 6. Valor: 30 d plant back (wheat only)
Broadleaf Herbicides Labeled 1. Wheat: Harmony/MCPA/2,4-D/Quelex 2. Barley: Harmony/MCPA/2,4-D/Quelex 3. Oats: Harmony/MCPA/2,4-D 4. Triticale: Harmony/2,4-D/Quelex 5. Rye: 2,4-D/MCPA