Herbicide Rate |
- Foliar applications generally at 3-8 quarts / acre with non-ionic surfactant
- Basal bark applications generally at 10% solution with methylated seed oil
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Breakdown / Inactivation |
- Short half-life in water depending on season and water depth – see photolysis
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Microbial |
- Microbial metabolism is primary degradation pathway in soil – half-life ~45 days
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Adsorption |
- Does not bind strongly or adsorb to soil particles
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Photolysis |
- Primary degradation pathway in water
- Half-life of 2.5 days (shallow water/summer) to 14 days (deep/winter)
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Hydrolysis |
- Not sensitive to hydrolysis
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Dissipation |
- Not used to control submersed plants in Florida – not applied directly to water
- Does not adsorb to soils – may be more persistent and more mobile in soils
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Formulation |
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Liquid |
- Available in liquid formulation
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Solid |
- Available in solid formulation combined with 2,4-D amine salt
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Mechanism of Action |
- Classified in WSSA Resistance Grouping #4
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Mode of Action |
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Systemic |
- Absorbed by foliage and translocates throughout plant tissues
- Moves to areas of new growth and causes a disruption in hormone levels
- Interferes with normal expansion and division of plant cells
- Acts like a growth stimulant in some plant tissues and a growth retardant in others
- Symptoms include cupped leaves and twisted stems
- Vascular tissue becomes crushed, stops movement of essential nutrients and sugars
- Plant essentially grows itself to death
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Plant Growth Regulator |
- Not used as a plant growth regulator in Florida aquatic plant control applications
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Stewardship |
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Herbicide resistance |
- No tolerance or resistance issues reported in Florida
- Rotate or use with 2,4-D, imazapyr, or glyphosate where appropriate
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Waterbody Parameters | Management Considerations |
Hydrology |
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Water depth |
- No issues related to this tool
- Not used for in-water applications at this time in FWC-funded programs
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Water volume |
- No issues related to this tool
- Not used for in-water applications at this time in FWC-funded programs
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Water movement |
- No issues related to this tool
- Not used for in-water applications at this time in FWC-funded programs
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Water chemistry |
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Dissolved oxygen (DO) |
- Slow acting herbicide used for shoreline applications and spot control within secluded marshes
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pH, alkalinity, hardness |
- No issues related to this tool
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Nutrient content |
- Slow acting herbicide used for shoreline applications and spot control within secluded marshes
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Water transparency |
- No issues related to this tool
- Not used for in-water applications at this time in FWC-funded programs
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Sediment characteristics |
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Composition |
- Sand/Clay – no issues related to this tool
- Organic – no issues related to this tool
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Potential for re-suspension |
- No issues related to this tool
- Does not readily adsorb to suspended material in tank mix water
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Plant Physiology Parameters | Management Considerations |
Plant origin / growth potential |
|
Native |
- Evaluated for spatter-dock (Nuphar advena) control
- Ineffective even at high rates and applied with 2,4-D
- Tussocks – mixed floating masses of woody and herbaceous plants
- Foliar applications at 3-8 qt / ac
- Usually applied with glyphosate, 2,4-D, or imazapyr
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Non-native |
- Primrose willow
- Foliar application at ~1.0 gpa
- In-water application at 1-2 ppm with 2,4-D
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Invasive
|
- Not applied to control invasive plants in FWC-funded program at this time
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Plant growth stage (target/non-target) |
- Need actively growing plants for herbicide uptake
- May need higher rates for mature plants
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Plant susceptibility (target/non-target) |
- Auxin-like activity
- Controls woody and broadleaf plants
- Most grasses and other monocots are tolerant
- Apply to actively growing target plants
- Apply when potential for drift is minimal to avoid damage to non-target plants
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Potential for regrowth (target/non-target) |
- Kills roots of susceptible plants allowing longer control than herbicides that only kill standing crop
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Climate Parameters | Management Considerations |
Weather |
Daily
- Rainfast in about two hours after application
- May damage adjacent woody or susceptible broadleaf plants due to drift
- Subject to FL DACS organo-auxin rule – 5E-2.033 F.A.C.
- Applications prohibited in winds above 10 mph
Seasonally
- Selectivity increases in winter when non-target plants like buttonbush are dormant
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Light intensity |
- May break down faster in clearer water or in more direct summer light
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Water temperature |
- No issues related to this tool
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