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

6 of 403

Species	Family	Common Name(s)	Organization	Control Technique	Cocktail	Satisfaction Rating	Size class (in regards to species)	Habitat Type	Trial or Observation?	Last Updated
Chromolaena odorata	Asteraceae	Devil weed	OANRP	aerial ball sprayer	2% RangerPro, Oust or Sulfomet, 98% water	successful. Recommended method	all age classes	MESIC	OBSERVED	2018-04-24	+
Chromolaena odorata	Asteraceae	Devil weed	OISC	basal-bark	20% G4, 80% Crop oil	minimal satisfaction				2018-02-05	+
Chromolaena odorata	Asteraceae	devil weed	OISC	cut-stump	20% G4U, 79.5% Crop oil 0.5%Turf trax	successful. Recommended method				2018-02-05
Chromolaena odorata	Asteraceae	Devil weed	OANRP	foliar	2% Round-up, Oust or Sulfomet, 98% water	successful. Recommended method	all age classes	MESIC	OBSERVED	2015-03-04	+
Chromolaena odorata	Asteraceae	Devil weed	OISC	foliar	0.16% (5g) Oust XP, 1.5% Round Up Pro Max, 97.84% Water, 0.5% Turf trax	more than moderate satisfaction	all age classes			2018-02-05	+
Chromolaena odorata	Asteraceae	Devil weed	OISC	hand-pull	none	successful. Recommended method				2018-03-21	+

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