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Tropical Spiderwort Management in Peanut, Corn, and Soybean

Tropical Spiderwort Management in Peanut, Corn, and Soybean. Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia Tifton. Control Strategies in Peanut. row spacing * twins vs. singles residuals * Dual Magnum * Strongarm POST’s * Gramoxone Max

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Tropical Spiderwort Management in Peanut, Corn, and Soybean

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  1. Tropical Spiderwort Management in Peanut, Corn, and Soybean Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences University of Georgia Tifton

  2. Control Strategies in Peanut • row spacing * twins vs. singles • residuals * Dual Magnum * Strongarm • POST’s * Gramoxone Max * Cadre * Basagran

  3. Tropical spiderwort control in peanut as influenced by row spacing a b Source: Yoder et al. 2003 (FL)

  4. Tropical spiderwort control in peanuts with Dual Magnum applied preemergence, Grady Co., 2003. Dual Magnum 7.64EC @ 1.33 pts/A

  5. Tropical spiderwort control with Gramoxone Max + Dual Magnum Tank-Mixes Gramoxone Max @ 5.5 ozs/A + Dual Magnum @ 1.33 pts/A Grady County

  6. A B Tropical spiderwort control in peanuts. A = untreated; B = Gramoxone Max + Dual Magnum applied 17 DAP. Photos taken 49 DAP.

  7. How much Dual Magnum can we use? • 1-1.33 pt/A • 2.8 pts/year • 90 day PHI • cost/A • $90/gal • $31.50/2.8 pts

  8. Other 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

  9. Strongarm in Peanut • PPI or PRE • thru cracking* • not labeled for POST use at this time but working on this issue * cracking = soil displaced by germinating seedlings just prior to emergence

  10. Tropical spiderwort control in peanuts with Strongarm @ 0.45 ozs/A, Grady Co., 2003. a a ab cd abc ab b c e PRE = 5 DAP EPOST = 17 DAP (2”, 3 leaf) LPOST = 31 DAP (up to 6”)

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

  12. Gramoxone Max and CadreTank-Mixed or Split Applications?

  13. Tropical spiderwort control withGramoxone Max and Cadre (LSD 0.05 = 22) (LSD 0.05 = 11) (LSD 0.05 = 15) Tank-mix applied 17 DAP/Split applied 17 and 31 DAP

  14. A B Tropical spiderwort control in peanuts. A = untreated; B = Cadre applied 7 DAP. Photos taken 49 DAP.

  15. What About Cadre + Dual Combos?

  16. Tropical Spiderwort Control with Cadre + Dual Magnum 114 DAP LSD 0.05 = 22

  17. Tropical spiderwort control in peanuts with Valor applied preemergence, Grady Co., 2003. Valor 51 WP @ 3 ozs/A

  18. Tropical Spiderwort in Field Corn • * preemergence • Dual II Magnum • Atrazine (?) • * postemergence • 2,4-D • Basagran • * post-directed • Gramoxone Max • Aim • Evik

  19. Tropical Spiderwort in Soybeans * narrow rows * preemergence Sencor Dual Magnum Boundary Canopy SP Canopy XL * postemergence Basagran * post-directed Gramoxone Max

  20. Post-Harvest Control Strategies • prevent seed production • re-growth after harvest • time before first frost • Gramoxone Max • 2,4-D • tillage

  21. Tropical spiderwort control with various herbicides - 14 DAT Applied October 31, 2003 6” tall spiderwort LSD 0.05 = 13

  22. Tropical Spiderwort in Australia • Weed problem for 20-30 years • control in other crops important • corn • 2,4-D • Dual • peanut • Pursuit • Dual • 2,4-D E.P. with Australian peanut farmer, Wayne Learmonte

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