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

7 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
Grevillea robusta	Proteaceae	Silk oak	CTAHR/OANRP	IPA-Incision Point Application	100% Milestone	successful. Recommended method	basal diameter 6-21.5cm	MESIC	TRIAL	2018-04-24	+
Grevillea robusta	Proteaceae	Silk oak	OANRP	IPA-Incision Point Application	100% Milestone	more than moderate satisfaction	Large	MESIC	OBSERVED	2018-04-24	+
Grevillea robusta	Proteaceae	Silk oak	CTAHR/OANRP/ NEPM	IPA-Incision Point Application	100% Round UP	unsatisfactory results	med-large	MESIC	TRIAL	2015-02-26
Grevillea robusta	Proteaceae	Silk oak	CTAHR/OANRP/ NEPM	IPA-Incision Point Application	100% Stalker	successful. Recommended method	med-large	MESIC	TRIAL	2015-02-26
Grevillea robusta	Proteaceae	Silk oak	CTAHR/OANRP/ NEPM	IPA-Incision Point Application	100% G4	more than moderate satisfaction	med-large	MESIC	TRIAL	2015-02-26
Grevillea robusta	Proteaceae	Silk oak	OANRP	girdle	20% G4, 80% Biodiesel	more than moderate satisfaction	large trees but time consuming		OBSERVED		+
Grevillea robusta	Proteaceae	Silk oak	OANRP	basal-bark	20% G4, 80% Biodiesel	successful. Recommended method	trees less than 5" diameter		OBSERVED		+

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