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
25 of 403
SpeciesFamilyCommon Name(s)OrganizationControl TechniqueCocktailSatisfaction RatingSize class (in regards to species)Habitat TypeEnvironmental factorsTrial or Observation?Last Updated
Acacia mearnsiiFabaceaeblack wattleKMWPIPA-Incision Point Application100% Glyphosatemoderate satisfactionsuccess with smaller diameter trees. less than 20 cmMESICTRIAL2015-10-07
Ardisia ellipticaMyrsinaceaeInkberryCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 15-19cmMESICTRIAL2018-04-23+
Callitris columellarisCupressaceaeMurray river cypress-pineCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)moderate satisfactiontrunk circumference 56-113cmMESICTRIAL2018-04-23+
Casuarina glaucaCasuarinaceaeiron woodCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)minimal satisfactiontrunk circumference 51-95cmMESICTRIAL2018-04-23+
Citharexylum caudatumVerbenaceaefiddlewoodCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 32-75cmMESICTRIAL2018-04-24+
Citharexylum caudatumVerbenaceaefiddlewoodCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)minimal satisfactiontrunk circumference 25-47cmMESICTRIAL2018-04-24+
Coffea arabicaRubiaceaecommon coffeeCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 17-34cmMESICTRIAL2018-04-23+
Cordia alliodoraBoraginaceaemanjackCTAHR/OANRP/ WaimeaIPA-Incision Point Application100% Ranger Pro (glyphosate)minimal satisfactiontrunk circumference 58-169cmMESICTRIAL2018-04-23+
Corymbia citriodoraMyrtaceaelemon eucalyptusCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 70-158.5cmMESICTRIAL2018-04-21+
Crocosmia crocosmiifoliaIridaceaeMontbretiaOANRPfoliarglyphosate (10ml/L) + Excort XP (0.4gram/L) + Surfactant (4ml/Lmore than moderate satisfactionLarge patches (2x2m or more)MESICTRIAL2018-03-21+
Cryptomeria japonicaCupressaceaetsugi pineCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)more than moderate satisfactiontrunk circumference 101-169cmMESICTRIAL2018-04-25+
Elaeocarpus grandisElaeocarpaceaeBlue marbleCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 48-149cmWETTRIAL2018-04-23+
Eucalyptus robustaMyrtaceaeEucalyptusOANRPdrill100% Ranger Prosuccessful. Recommended methodLarge trees (6'+ diameter)MESICTRIAL2015-02-23+
Fraxinus uhdeiOleaceaeTropical ashCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 52-109cmMESICTRIAL2018-04-23+
Heliocarpus popayanensisTiliaceaeWhite mohoCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)unsatisfactory resultstrunk circumference 42-98cmMESICTRIAL2018-04-23+
Leptospermum scopariumMyrtaceaemanuka, New Zealand tea treeCTAHR/OANRPIPA-Incision Point Application100% Ranger Pro (glyphosate)successful. Recommended methodtrunk circumference 23-67cmWETTRIAL2018-04-23+
Leptospermum scopariumMyrtaceaemanuka, New Zealand tea treeOISC/KMWPcutsuccessful. Recommended method+
Ricinus comminusEuphorbiaceaeCastor beanTNC Kauaicut-stump100% Round up Concentrate Plus (18% glyphosate)successful. Recommended method1 to 3 inch stem diameter.MESICOBSERVED2021-04-22+
Schefflera actinophyllaAraliaceaeOctopus treeCTAHR/OANRP/ NEPMIPA-Incision Point Application100% Milestonesuccessful. Recommended methodtrunk circumference 27-54cmMESICTRIAL2015-02-26+
Schefflera actinophyllaAraliaceaeOctopus treeCTAHR/OANRP/ NEPMIPA-Incision Point Application100% Polarissuccessful. Recommended methodtrunk circumference 27-54cmMESICTRIAL2015-02-26+
Schefflera actinophyllaAraliaceaeOctopus treeCTAHR/OANRP/ NEPMIPA-Incision Point Application100% G4unsatisfactory resultstrunk circumference 27-54cmMESICTRIAL2015-02-26+
Schefflera actinophyllaAraliaceaeOctopus treeCTAHR/OANRP/ NEPMIPA-Incision Point Application100% Roundupsuccessful. Recommended methodtrunk circumference 27-54cmMESICTRIAL2015-02-23+
Spathodea campanulataBignoniaceaeAfrican tulipTNC KauaiCut stump100% Round up Concentrate Plus (18% glyphosate)successful. Recommended methodSmall to large.WETOBSERVED2021-04-22+
Syzygium cuminiMyrtaceaeJava plumOANRPIPA-Incision Point Application100% Ranger Pro (glyphosateunsatisfactory resultstrunk circumference 55-144cmMESICTRIAL2018-04-24+
Urochloa maximaPoaceaeGuinea grassTNC Kauaifoliar5% Roundup Concentrate Plus, water dilution (1% Glyphosate)more than moderate satisfactionAll sizesWETOBSERVED2021-04-22+

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