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Pat Minogue, Ph.D., R.F. Assistant Professor of Silviculture
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Adjuvants: Materials added to spray
mixtures to enhance performance or improve application efficiency
•Surfactants (Wetter, Spreader, Sticker) •Oils •Emulsifiers •Water Conditioners •Drift Mitigation •Foam Reducers •4000 products in US •Largely not regulated
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Product formulations vary!!!
•Many products are “Ready to Use” or already have surfactants, emulsifiers, etc. in the product formulation
Arsenal® AC does not contain surfactant
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Common forestry products without surfactants Common Name Trade Names
glyphosate Accord® Concentrate Foresters’®
imazapyr Arsenal® AC Polaris®
metsulfuron methyl Escort® XP® Patriot®
sulfometuron methyl Oust® XP® Spyder®
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Surfactants and Oils Increase spread on leaf improving absorption
Increase deposition efficiency on leaf surface
Poor coverage Droplet bounce
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It dissolves in water (water-loving, hydrophylic)
or it dissolves in oil (lipid or oil loving, lipophylic)
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WATER
OIL
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Oil and oil emulsion carriers
Advantages Excellent droplet spread
Reduced evaporation, greater absorption
Good deposition, little “bounce”
Solvent to the cuticle, the wax covering the leaf, more herbicide gets inside the plant
Disadvantages Costs more than water
Potential worker exposure/toxicity
Potential volatility, drift
Spray preparation may not be as stable
More difficult to clean equipment
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The power of surface tension holds water together
The force of hydrogen bonding
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Wetting agents reduce surface tension increasing droplet spread and uptake
Herbicide in water
Herbicide in water plus surfactant
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Sept-99 12
Polymers reduce droplet bounce
Expansion Impact Retraction
No Sticker
Sticker (Polymer)
Reference: Bergeron, V., Martin, J-Y., and Vovelle, L. 2003. Use of polymers as sticking agents. U. S. Patent 6,534,563. Bergeron, V., Bonn, D., Martin, J-Y., and Vovelle, L. Controlling droplet deposition with polymer additives. Nature 2000: 405:772-775.
BOUNCE
NO BOUNCE
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How do surfactants work?
N
OO
OH
O
OOHH
Non-polar Polar
Oil-loving
Water-loving
Polyethoxylate
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Surfactants
reduce the energy
holding the water
droplet together
resulting in better
coverage
“Contact angle” is reduced
Water
Water
Water plus Surfactant
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Silicone surfactants •Super spreaders
•Used at very low rates, ½-1 pints per 100 gallons spray
•Form emulsions in water
•Eye irritant
•May cause foaming
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Common products Surfactants Non-ionic surfactant
such as polyethoxylates, 1-3 quarts per 100 gal spray (0.25-0.75% solution)
Silicone, containing silicone
Oils Crop oils, paraffin derived
from mineral oil
Basal oils, mixed mineral oils containing paraffin, aromatic and napthelene
Methylated seed oil (MSO), esterified free fatty acids from plant glycerol (bio-deisel)
Tallow amine, free fatty acids from animal fat
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Common oil-based forestry herbicides
Common Name
Trade Names
tricopyr ester
Garlon® 4 Tahoe® 4E
2,4-D ester Weedar® Many others
2,4-DP ester Weedone® Many others
Emulsifiers in formulation
Phenoxies and pyridinecarboxylic acids
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Emulsifiers mix oil and water
Emulsions enhance herbicide uptake
Reduce evaporation, provide drift mitigation
Emulsifiers promote the suspension of one liquid in another
Emulsions are milky-white, micelles dispersed in water
Emulsifiers are amphoteric molecules with polar heads and non-polar tails.
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Two kinds of emulsions: Oil in Water Water in Oil Most common
Emulsifiable Concentrate (EC) products make these
Require careful mixing, injector systems
Provide drift mitigation
Reduce volatile losses
KEEP WATER OUT after mixing!
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Water Quality Problems?
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Water conditioners: Reduce interaction of herbicide and water
Water Problems:
Hard Water
Iron
Carbonates
pH
Clay
Algae
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Water conditioners, many products for specific uses
•Polyacrylates (Quest®)
•Ammonium Sulfate
•Phosphate ester surfactants (Buffer® PS)
•Chelates (EDTA)
•pH Buffers (TSPP)
•Acids
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Glyphosate (Accord®, Roundup®, etc) is sensitive to water quality issues! Water hardness (Ca++, Mg++, Fe++) precipitates glyphosate
Limestone regions: High pH, hardness, bicarbonates
Add water conditioner if
hardness greater than 120 ppm
Ammonium Sulfate,
NH4SO4, precipitates
calcium, add 7-18 lb
per 100 gallons,
BEFORE HERBICIDE!
Water Hardness
Limestone
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Larger droplets are less prone to drift! Droplet size determined by: Size and Type of Nozzle
Larger nozzle orifice size means a larger droplet
Pressure at the Nozzle Lower pressures produce less fines
Application Height
Potential for movement increases with height
Spray droplets evaporate as they fall, making them smaller
Droplet Shear
Evaporative Losses While Airborne
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Drift mitigation agents: Larger droplets are less prone to drift!
Polymers (polyacrylamide, polyvinyl) increase viscosity, make droplets larger, less prone to drift. Used for water-based spray. (Nalcotrol)
Oil Emulsions reduce droplet shear at nozzle, evaporation of droplets
Organic Gums (guar gum) increase viscosity, increase droplet mean diameter (DMD)
Prop-wash plus!
Excessive amounts of surfactant increase drift potential!
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Advances in aerial application technology Controlled droplet size application systems:
Droplets form in airstream
Uses very low pressure
Micro-Foil® Boom
Accu-Flo® Nozzles Thru-Valve® Boom
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Foam reducing agents Keep a foam-buster on hand, a little bit goes a long way
Foaming is a common problem due to: Excessive surfactant concentrations
Lower spray application volumes, higher herbicide product concentrations
Greater use of dry formulations
Less use of emulsifiable concentrates
Add foam control agents prior to pesticides Anti-foaming agents prevent foaming
De-foaming agents correct the problem
The best products do both
Common problem with glyphosate products
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Mixing order: Least to most soluble, in general Fill tank half-full, start agitation
Consider screening, 20-35 mesh at opening
1) Wetable powder (WP), first slurry in water
2) Dry flowable (DF), pre-mix in water
3) Emulsifiable Concentrate (EC), pre-mix 1:2 in water
4) Drift Control
5) Water soluble liquid (SL)
6) Surfactant, ADD LAST!
CONTINUE AGITATION (except when filling)
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Sources of additional information
Southern Regional Extension Forestry: http://www.sref.info/
Integrated Forest Vegetation Management Website http://ifvm.ufl.edu/ Patrick J. Minogue, Ph.D., R.F. Assistant Professor of Silviculture North Florida Research and Education Center Quincy, FL 32303 [email protected]
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