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Peanut Weed Control Update 2004

Peanut Weed Control Update 2004. Eric P. Prostko Extension Weed Specialist. Things to Talk About. Valor Arrow Prowl H 2 0 newer metolachlor formulations postemergence Strongarm reduced rates glyphosate problems. Peanuts Valor Formulations. 2001: 51 WDG 2002-03: 51 WP

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Peanut Weed Control Update 2004

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  1. Peanut Weed Control Update2004 Eric P. Prostko Extension Weed Specialist

  2. Things to Talk About • Valor • Arrow • Prowl H20 • newer metolachlor formulations • postemergence Strongarm • reduced rates • glyphosate problems

  3. PeanutsValor Formulations • 2001: 51 WDG • 2002-03: 51 WP • 2004: Valor SX 51WDG * smaller particles * dispersing agents * easier to get into suspension * 10% price reduction in 04’

  4. PeanutsArrow 2EC • clethodim • POST grass control in broadleaf crops • generic Select • Makhteshim-Agan • 6 -16 ozs/A • price/service

  5. PeanutsProwl H20 3.8CS • 2004 • 3.8 lbs/gal • 2.0 pts/A • water-based • micro-encapsulated • less staining • better for strip-tillage? • increased price

  6. Prowl H20 pendimethalin EC Prowl H2O

  7. PeanutsNew Metolachlor Formulations • Cinch • Dupont • same as Dual II Magnum • cannot use POST • Stalwart C • Sipcam Agro USA Inc. • “old” Dual EC formulation (7.8 lbs/gal) • not labeled for peanut • Me-Too-Lachlor • Drexel • “old Dual EC formulation (8 lbs/gal) • rates are too low

  8. PeanutsStrongarm Postemergence • labeled in March 2000 • PPI, PRE, AC • broadleaf weeds • 0.45 ozs/A • $15-18/A • 6% of GA acres in 2001 • 10 month cotton rotation restriction • ALS inhibitor

  9. Tropical spiderwort control withPOST applied Strongarm, 2003 Untreated Strongarm applied 31 DAP Strongarm applied 17 DAP PE-24-03 46 DAP

  10. Bristly Starbur Control with POSTApplied Strongarm, 2003 Untreated Strongarm @ 0.113 ozs/A Strongarm @ 0.45 ozs/A PE-27-03 32 DAT

  11. Annual MG Control with POST Applied Strongarm, 2003 Strongarm 0.45 ozs/A + 80/20 @ 0.25% v/v (Applied 5 WAP) Untreated 11 WAP

  12. Wild poinsettia control with POST herbicides, 2003 Cadre @ 1.44 ozs/A Strongarm @ 0.45 ozs/A Untreated PE-15-03 67 DAT

  13. Wild Radish Control with POST Applied Strongarm (1”, 3-4 leaf) Untreated Strongarm 0.45 ozs/A Strongarm 0.225 ozs/A 40 DAT

  14. PeanutsStrongarm Postemergence Summary • good to excellent POST control of several species • reduced rates on sensitive species such as bristly starbur, annual morningglory, wild radish • timing and rate are critical on some species such as beggarweed • no POST control of sicklepod • not labeled at this time but working on this issue • rotation restrictions?????

  15. Reduced Rates of Strongarm and Valor - I Strongarm 0.45 ozs/A Untreated Valor 3 ozs/A Strongarm 0.113 ozs/A + Valor 0.75 ozs/A PE-01A-03 91 DAP

  16. Reduced Rates of Strongarm and Valor - II Untreated Strongarm 0.45 ozs/A Valor 3 ozs/A Strongarm 0.113 ozs/A + Valor 0.75 ozs/A PE-01B-03 91 DAP

  17. Economic Returns from Reduced Rates of Strongarm (S), Valor (V), and Cadre - I PE-01A-03 Tifton

  18. Economic Returns from Reduced Rates of Strongarm (S), Valor (V), and Cadre - II PE-01B-03 Attapulgus

  19. SummaryReduced Rates • less injurious than Valor at full rate • similar weed control except for tropical spiderwort and annual mg • when used in total program (pre + post), equivalent yields and net returns when compared to full rate programs • same program in one field may not be the best in another field • digging efficiency/weed seed bank concerns in field with a few escapes?

  20. Glyphosate Mishaps in Peanut!

  21. Roundup WeatherMax vs. Crop Oil

  22. Yield Losses Caused By Roundup Weather Max Applied to Virginia Peanuts @ 30 DAP. Source: Adapted from B. Robinson, NCSU (3 years of data)

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