New Woody Plant Herbicides

J. Ferrell and B. Sellers, University of Florida

Aminopyralid vs Picloram

Picloram

Aminopyralid(Milestone VM)

• Both pyradine chemistry with one Cl difference• Both have significant soil activity• Aminopyralid is much more active• Both molecules should have brush activity

Aminopyralid on Brush

• Seems to have little impact on brush when applied alone

• But, has been shown to be synergistic with applied with other herbicides.

Aminopyralid

Aminopyralid + 2,4-D

Objective

• Determine if the addition of aminopyralid with standard brush control mixes improves efficacy.

Sweet gum control - broadcast

Glyphosate – 1 gal/A, triclopyr ester – 1 gal/A, imazapyr – 1 pt/A, Milestone VM – 7 oz/A

Persimmon in Pasture

Persimmon control - broadcast

triclopyr ester – 1 qt/A, fluroxypyr – 40 oz (Vista), Milestone VM –7 oz/A

Fluroxypyr (Vista)

Triclopyr ester

Individual Plant Treatment

Sweet gum control - IPT

Glyphosate – 4%, triclopyr ester – 2%, imazapyr – 0.5%, Milestone VM – 0.5%

Triclopyr - 2%

Triclopyr - 2% + Aminopyralid 0.5%

Triclopyr - 2% + Glyphosate 4% Triclopyr - 2% + Glyphosate 4% + Aminopyralid 0.5%

Cut Stump

Stump resprouting 1 YAT

Rate (v/v) Water Oak Sweet gum

% respoutingMilestone VM Plus 100% 0 0Milestone VM Plus 50% 0 0Garlon 3A 33% 0 0Milestone VM 10% 0 0

Milestone VM Plus – Triclopyr amine (1 lb/gal) + aminopyralid (0.1 lb/gal)

Untreated Milestone 10%

Conclusions

• Aminopyralid doesn’t appear to improve control of the brush species we tested.– Aminopyralid appears to be excellent on

legume trees (mimosa, lead tree (leucena), etc).

• Aminopyralid effectively suppresses stump sprouting for at least 1 year.

Aminocyclopyrachlor (MAT 28) for brush controlA. Ezell and J. YeiserMississippi State and

Steven F. Austin

What is MAT 28?

• New herbicide from DuPont• Auxin mimic like triclopyr and

2,4-D.• Very low volatility• Excellent on broadleaf weeds• Registration – mid to late

2010 – we hope• Will be sold mixed with many

different herbicides

Products with MAT 28

• Plainview – (MAT + Oust + Telar) – bare ground• Whole US

• Streamline (MAT + metsulfuron) – brush and roadsides

• Whole US• Viewpoint (MAT + metsulfuron+ Imazapyr) –

brush control• SE (hardwoods) and SW (salt cedar)

• Perspective – (MAT + Telar) - roadsides• East of MS river

What does it control?

• Persimmon - Excellent• Maple - Excellent• Oaks – variable control, must add

imazapyr or glyphosate• Weak on sweetgum – must add imazapyr

or glyphosate

Waxy Species

• Marginal control of wax myrtle and yaupon. Need to add triclopyr to improve control.

• Excellent on beautyberry.

What about pine?

• Pines– Excellent on small native pines– Soil residual may injure newly set pines. – May be an excellent site-prep herbicide, but

replant interval is currently unknown.

Conclusion

• MAT 28 is excellent on a number of broadleaf weeds.

• MAT 28 will likely improve control of some troublesome species.

• For broad-spectrum brush control, it is hard to beat imazapyr, glyphosate, triclopyr combinations.