glyphosate, imazapyr and ?? – herbicides for grass … · g rasses upland annual grasses seed...
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GLYPHOSATE, IMAZAPYRAND ?? – HERBICIDES FORGRASS CONTROL -
Greg MacDonaldAgronomy Dept. – University of Florida
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TYPES OF GRASSES Perennial or Annual Bunch or Spreading Stolons or Rhizomes Viable Seeds or Not-so Viable?
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GRASSES Upland annual grasses seed producing
Upland perennial grasses both seed and non-seed producing
Aquatic perennial grasses both seed and non-seed producing
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Masai Mara National Reserve, Kenya Natalgrass
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COGONGRASS Native to southeast Asia Highly adapted to poor soils,
drought, pyrogenic ecosystems Extensive rhizomes Successful/persistentin low light
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NEW ‘OLD’ PROBLEMS Bamboo – running and clumping types Elephantgrass Arundo Burma-reed Phragmities others?
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TORPEDOGRASSNative to Africa and or AsiaIntroduced into Florida in late 1800’s as a
wetland forage grassPerennial, spreads through stolons and
rhizomesNamed for sharply pointed or ‘torpedo-like’
growing tips
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MATURE PLANTPerennial grass, roots on shore and will
extend several feet out into shallow waterWill grow up thru the water columnForms dense monoculture along shoreline of
lakes and ponds
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PARAGRASSSemi-aquatic grassStolons only3 ft tall erect; up to
15 ft long Prefers water
fluctuations
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Terminal spike flower - 8 in. long with branchesOften purple-tinged
Seed produced but low germination
Leaf sheath - dense stiff hairs
Leaf flat 0.5 wide and 10-12 in. long
Hairy and swollen nodes
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LIMPOGRASSSemi-aquatic grassStolons only3 to 6 feet tallIntroduced as a
forage and still widely utilized
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Leaf sheath smooth, sometimes with fringe of hairs
Often a red tingeLeaves 2 to 6 in. long;
0.25 wide
Single spike - 2 to 8 in. longSeed - Few produced, but highly viable
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NEW PROBLEMS?Luziola - Tropical
American water grass
Sweet tanglehead energy grasses?
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MANAGEMENT STRATEGIES
Key Steps:1) identification2) control procedure/method*
level of infestationlocation/ecosystem
3) monitor regrowth or reinfestation
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METHODS OF MANAGEMENT Prevention Cultural Biological Mechanical Chemical – Herbicide SelectionRate, Timing, Application Type Glyphosate, Imazapyr, etc.
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PREVENTATIVE AND CULTURAL
How does it spread? rhizomes or seedRhizomes moved through equipment, water
(flood events), fill dirt, dredging Seed spread is more difficult, moved
through same ways, but also animals, windKEY is minimizing disturbance and
maintaining a good cover of desirable species
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BIOLOGICALCONTROL Selectivity is the big issue
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MECHANICALPlow or Disk deep enough to cut through (6-12 inch)multiple times, passes during dry seasons if possible if mechanical only, need 2 to 3 intervals
of disking to ensure rhizome kill if integrating herbicides, allow for good
regrowth ~ 12 to 18 inches if the grass spreads by seed, it may
make the problem worst
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FLOODING use water to aid in control time herbicide or mechanical
control prior to water essentially drown the plants as
they try to recover key is getting water above the
foliage
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BURNING very effective in removing dead
thatch, leaves stimulates regrowth, depletes
carbohydrate reserves generally results in better control
with herbicides – must wait for good regrowth (12-18 inches) can be used with flooding also
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HERBICIDESNON-SELECTIVE – will control all speciesImazapyr (Arsenal, etc.) Use high rates – 1.5 to 4 pints/A (0.5 to 1% solution) Non-crop areas such as rights-of-way and fence rows Treated areas will be bare for 6 months to a year Be wary of off-target damage
Glyphosate (Roundup, etc.) Use high rates 3-4 qt/A (2-4% solution) Multiple applications are needed No residual soil activity
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GlyphosateRapidly absorbed by foliar/green
tissuesTranslocated in phloem to areas of
active growthBinds to the enzyme EPSP
synthaseBlocks the shikimate acid pathwayPrevents aromatic amino acid
synthesisPlant cannot make proteins,
enzymesGrowth stops, meristems die, plants
die
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Rapidly absorbed by foliar/green tissues and roots
Translocated in phloem to areas of active growth
Binds to the enzyme acetolactatesynthase
Blocks the ALS/AHAS pathwayPrevents branched chain amino
acid synthesisPlant cannot make proteins,
enzymesGrowth stops, meristems die,
plants die
Imazapyr and Imazapic
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HERBICIDESSELECTIVE TOWARDS GRASSES ONLY Grass control in natural/aquatic areas Recent registration - TIGR Herbicide - SePro Used in cropping systems since 1980’sGood on annuals, moderate on perennials However, may provide suppression to allow
desirable species to dominate Also evaluating Fluazifop
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Sethoydim and FluazifopFoliar active only, grasses only due to
different form of target enzymeRapidly absorbed by foliar/green tissuesTranslocated in phloem to areas of active
growthBinds to the enzyme Acetyl-CoA
carboxylaseBlocks the fatty acid/lipid synthesis
pathwayPrevents fatty acid synthesisPlant cannot make lipids, cell
membranesGrowth stops, meristems die, plants die
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Symptomology on Grasses
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NEW OPPORTUNITIES Pre-emergence herbicide options indaziflam (Esplanade), pendimethalin
Target those grasses that are prolific seeders
Provide control of germinating grass seedlings, but other seedlings as well
generally will not injure established plantsTiming is critical – need to understand
germination phenology
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