UHELP
Data

Weed Control by Species

Records herbicide and mechanical control methods, products, and satisfaction ratings for invasive weed species in Hawaiʻi, contributed by multiple partner organisations.

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403rows
88species, each with its own page
15organisations reporting
9active ingredients
Oct 2026last updated
By active ingredient

Triclopyr

Group 4

Synthetic auxin · some products labelled for aquatic sites

166 reports61 species3.8 / 5 average

Best on Acacia mearnsii, Acacia mangium, Ageratina riparia, Ageratina adenophora

Glyphosate

Group 9

EPSP synthase inhibitor · some products labelled for aquatic sites

83 reports44 species3.2 / 5 average

Best on Ageratina riparia, Ardisia crenata, Axonopus fissifolius, Cortaderia selloana

Imazapyr

Group 2

ALS inhibitor · some products labelled for aquatic sites

58 reports31 species3.5 / 5 average

Best on Ardisia elliptica, Cecropia obtusifolia, Coffea arabica, Grevillea robusta

Aminopyralid

Group 4

Synthetic auxin · no aquatic-labelled products

57 reports29 species3.3 / 5 average

Best on Cryptomeria japonica, Delairea odorata, Leucaena leucocephala, Morella faya

Sulfometuron-methyl

Group 2

ALS inhibitor · no aquatic-labelled products

6 reports2 species4.5 / 5 average

Best on Pterolepis glomerata, Chromolaena odorata

Fluazifop-P-butyl

Group 1

ACCase inhibitor · no aquatic-labelled products

5 reports3 species4.4 / 5 average

Best on Axonopus fissifolius, Paspalum conjugatum, Melinis minutiflora

Aminocyclopyrachlor

Group 4

Synthetic auxin · no aquatic-labelled products

4 reports4 species3.8 / 5 average

Best on Acacia confusa, Toona ciliata, Leucaena leucocephala, Corymbia citriodora

Metsulfuron-methyl

Group 2

ALS inhibitor · no aquatic-labelled products

1 report1 species4.0 / 5 average

Best on Hedychium gardnerianum

Clopyralid

Group 4

Synthetic auxin · no aquatic-labelled products

1 report0 species5.0 / 5 average
9 of 403
SpeciesFamilyCommon Name(s)OrganizationControl TechniqueCocktailSatisfaction RatingSize class (in regards to species)Habitat TypeEnvironmental factorsTrial or Observation?Last Updated
Spathodea campanulataBignoniaceaeafrican tulipCTAHR/OANRPIPA-Incision Point Application100% Polarismoderate satisfactiontrunk circumference 63-225cmMESICTRIAL2018-04-24+
Spathodea campanulataBignoniaceaeafrican tulipCTAHR/OANRPIPA-Incision Point Application100% Milestoneminimal satisfactiontrunk circumference 63-225cmMESICTRIAL2018-04-23+
Spathodea campanulataBignoniaceaeafrican tulipCTAHR/OANRPIPA-Incision Point Application100% Ranger Prounsatisfactory resultstrunk circumference 63-225cmMESICTRIAL2018-04-23+
Spathodea campanulataBignoniaceaeafrican tulipCTAHR/OANRPIPA-Incision Point Application100% Garlon 4 Ultraunsatisfactory resultstrunk circumference 63-225cmMESICTRIAL2018-04-23+
Spathodea campanulataBignoniaceaeAfrican tulipTNC KauaiCut stump100% Round up Concentrate Plus (18% glyphosate)successful. Recommended methodSmall to large.WETOBSERVED2021-04-22+
Spathodea campanulataBignoniaceaeafrican tulipNEPMIPA-Incision Point ApplicationMilestoneunsatisfactory results+
Spathodea campanulataBignoniaceaeAfrican tulipOANRPgirdle20% G4, 80% Biodieselminimal satisfactionlarge treesOBSERVED+
Spathodea campanulataBignoniaceaeAfrican tulipOANRPcut-stump20% G4, 80% Biodieselmoderate satisfactionlarge treesOBSERVED
Spathodea campanulataBignoniaceaeAfrican tulipOANRPclip and drip20% G4, 80% Biodieselsuccessful. Recommended methodsmall treesMESICOBSERVED+

Kept by UHELP. Ratings and notes are the reporting organisation’s own. For herbicides, always follow the product label — the label is the law.