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Glyphosate-resistant Palmer amaranth

2008 Vegetable Update. Glyphosate-resistant Palmer amaranth. Loss of Methyl Bromide. Fumigant Buffer Restrictions. Potential MB Alternatives. MIDAS 67:33 (methyl iodide + chloropicrin) DMDS 79:21 (dimethyl disulfide + chloropic.) Telone II fb chloropicrin fb Vapam (3 WAY).

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Glyphosate-resistant Palmer amaranth

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  1. 2008 Vegetable Update Glyphosate-resistant Palmer amaranth Loss of Methyl Bromide Fumigant Buffer Restrictions

  2. Potential MB Alternatives • MIDAS 67:33 (methyl iodide + chloropicrin) • DMDS 79:21 (dimethyl disulfide + chloropic.) • Telone II fb chloropicrin fb Vapam (3 WAY)

  3. 2007 On Farm Replicated MB Alternative Trials 2007

  4. MIDAS AS GOOD AS MB: Crop growth, weeds, diseases, nematodes, fruit maturity, fruit size, yields WEAKNESS: Mulch type, costs

  5. Number of nustedge emerging through mulch per acre. Spring 2007. Ponder Farm.* HEAVY NUTSEDGE INFESTATIONS

  6. MIDAS WEAKNESS: Mulch type, costs *Either get a “deal” on the costs or one is forced to reduce the rate below what is effective……. On farm rates were 170-175 lb/A broadcast

  7. DMDS LEARNED IN 2007: 1. Have to use alternative mulch

  8. DMDS 74 G, LDPE DMDS 56 G, VIF

  9. DMDS 60 G, VIF DMDS 70 G, LDPE

  10. DMDS 60 G, VIF MB

  11. DMDS • THINGS WE KNOW: • Have to use alternative mulch • Smells really really really bad!!!! • THINGS STILL TO FIGURE OUT: • Exact rate when used with alternative mulch • Price

  12. UGA 3-WAY AS GOOD AS MB: Crop growth, weeds, diseases, nematodes, total fruit production BETTER THAN MB: Earlier 1st crop pepper (more jumbo) Much cheaper WEAKNESS: Pain to apply, no room for error, plant back

  13. MB 50:50 • Not as effective as MB 67:33 • Need to increase rate of 50:50 by 10-20% depending on weed infestation • After getting your rate correct, you can reduce the rate up to 40% with blockade or similar type mulch • Escapes will happen in the fall

  14. Long term impacts of fumigant systems on nutsedge populations per acre.* *Long term study with spring pepper and fall cucumber treated with same fumigant each year. Herbicides applied b/w crops.

  15. Long term impacts of fumigant systems on nutsedge populations per acre.* *Long term study with spring pepper and fall cucumber treated with same fumigant each year. Herbicides applied b/w crops.

  16. Economic Impact of Buffer Restrictions for Georgia.

  17. Research Objectives Address the variables actually impacting gas emissions! Soil moisture Soil texture Soil temperature Soil compaction Mulch types Application procedures

  18. Funnel glued to mulch and then left for a set amount of time GASTEC GV100S Silicone Glue Detector Tube Range 0.1 to 18 ppm

  19. Research Objectives Address the variables actually impacting gas emissions! Soil moisture Soil texture Soil temperature Soil compaction Application procedures Mulch types

  20. LDPE VIF

  21. Research Objectives Address the variables actually impacting gas emissions! Soil moisture Soil texture Soil temperature Soil compaction Application procedures Mulch types

  22. Research Objectives Address the variables actually impacting gas emissions! Soil moisture Soil texture Soil temperature Soil compaction Application procedures Mulch types

  23. Research Objectives Will likely end up with a +/- system

  24. Research Objectives Will likely end up with a +/- system Fumigant X: Buffer restriction 500 feet Ideal moisture (X – X): subtract 50 feet Ideal texture (X-X): subtract 50 feet Ideal compaction (X-X): subtract 50 feet Ideal soil temp (X-X): subtract 50 feet Mulch X or Y: subtract 50 feet Ideal acres treated/day: subtract 50 feet

  25. WHO WILL POLICE THIS?

  26. Herbicides

  27. Alanap Going Away • Chemtura voluntarily canceling registration • Production was stopped Oct. 2007 • 50,000 gal inventory • 2.5 years of inventory if normal use continues • Shelf life is about 3 years

  28. Chateau Row Middle Labels • Third Party Registration by GFVGA for Georgia • Fruiting vegetables (summer 2008) • Cucurbits (summer of 2008?)

  29. Likely Chateau Row Middle Labels • Raised bed only • Up to 4 oz/A (hopefully) • Can not touch the mulch • Product can not be effectively washed from the mulch

  30. Chateau Activity After Washing Mulch Non-treated Chateau preplant applied and washed with ½” water

  31. Likely Chateau Row Middle Label • 5. Apply PRIOR to transplant • Must rain after application, prior to transplant • Residual control of purslane, eclipta, pigweeds, beggarweed • 8. Need tank mix partner for grasses

  32. Great fit for row middles without cover crop...what happens with cover?

  33. Chateau PRE Chateau Spike Chateau POST

  34. Non-treated Chateau POST

  35. Bill Brim, LTF ON FARM COOPERATORS Martin Flora, SVP Russ Hamlin, CF

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