Leucaena leucocephala
koa haole
Introduced and causing ecological or economic harm.
Nitrogen-fixing leguminous tree ubiquitous on disturbed lowland sites. Displaces native coastal vegetation; extremely difficult to eradicate due to prolific seeding and resprouting.
Leucaena leucocephala is a small fast-growing mimosoid tree native to southern Mexico and northern Central America (Belize and Guatemala) and is now naturalized throughout the tropics.
Read more on Wikipedia →September – November
Fruiting peaks in December. Treating before seed set prevents the next cohort; treating after it disperses the problem. This window is the three months preceding peak fruiting.
This is an inference, not a schedule. The curve reflects when observers annotated flowering and fruiting — which tracks observer effort as well as plant behavior, and pools all elevations and islands into one signal. Hawaiʻi’s microclimates vary enormously; a species may fruit in January at sea level and June at elevation. Use this to know when to look, then look.
Controlling Leucaena leucocephala
Best reported: IPA-Incision Point Application with 100% Milestone — 2 reports from CTAHR/OANRP, CTAHR/OANRP/ NEPM.
5.0IPA-Incision Point Application100% MilestoneAminopyralidG4
- 5successful. Recommended method · CTAHR/OANRP · trial · 2018-04-24
Milestone Trial: tested 2 cuts/trunk against 1 cut/trunk (both received 0.5ml/cut); 20 trees total tested. At 4 months, all trees of both treatments were fully defoliated, all 2 cut (n=10) treatments were dead, and 3 of 10 trees with 1 cut treatment were dead. At 29 months, all trees of both treatments dead/gone. Both treatments worked, but 2 cut treatment worked faster. Suggest 1 cut/trunk treatment, as only 8oz of Milestone can be used per acre per year.
- 5successful. Recommended method · CTAHR/OANRP/ NEPM · trial · 2015-02-23
haole koa 'brains". 17 month trial. 2 cuts/brain, 0.5ml/cut. At 12 months, 4 of 4 dead.
4.0IPA-Incision Point Application100% Mat 28AminocyclopyrachlorG4
- 4more than moderate satisfaction · CTAHR/OANRP/ NEPM · trial · 2015-02-26
haole koa 'brains". 17 month trial. 2 cuts/brain, 0.5ml/cut. At 13 months, 3 of 4 brains dead.
4.0cut-stump50% G4, 50% Crop oilTriclopyrG4
- 4more than moderate satisfaction · NEPM · observed · 2015-02-26
4.0cut-stump40% G4, 60% BiodieselTriclopyrG4
- 4more than moderate satisfaction · OANRP · observed
Sometimes time consuming to get nice clean cut. Some individuals have woody masses at soil line (brains) with multiple trunks; these brains need trunks cut and
1.0IPA-Incision Point Application100% Round UpGlyphosateG9
- 1unsatisfactory results · CTAHR/OANRP/ NEPM · trial · 2015-02-26
haole koa 'brains". 17 month trial. 2 cuts/brain, 0.5ml/cut. At 13 months, 4 of 4 brains alive.
1.0IPA-Incision Point Application100% PolarisImazapyrG2
- 1unsatisfactory results · CTAHR/OANRP/ NEPM · trial · 2015-02-26
haole koa 'brains". 17 month trial. 2 cuts/brain, 0.5ml/cut. At 13 months, 4 of 4 brains alive.
1.0IPA-Incision Point Application100% G4TriclopyrG4
- 1unsatisfactory results · CTAHR/OANRP/ NEPM · trial · 2015-02-26
haole koa 'brains". 17 month trial. 2 cuts/brain, 0.5ml/cut. At 13 months, 4 of 4 brains alive.
Ratings are the reporting organisation’s own, on a 5-point scale. Always follow the product label — the label is the law. See these 8 rows in the full table
