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

18 of 403

Species	Family	Common Name(s)	Organization	Control Technique	Cocktail	Satisfaction Rating	Size class (in regards to species)	Habitat Type	Environmental factors	Trial or Observation?	Last Updated
Psidium cattleianum var. lucidum	Myrtaceae	strawberry guava	CTAHR/OANRP	IPA-Incision Point Application	100% Polaris	minimal satisfaction	trunk circumference 50-80cm	MESIC		TRIAL	2018-04-24	+
Psidium cattleianum	Myrtaceae	Strawberry guava	OANRP	cut-stump	20% G4, 80% Crop oil	more than moderate satisfaction	effective on a variety of sizes.	MESIC		OBSERVED	2018-04-24	+
Psidium cattleianum	Myrtaceae	Strawberry guava	OISC	cut-stump	20% G4, 80% Crop oil	more than moderate satisfaction	effective on a variety of sizes.	MESIC		OBSERVED	2018-04-24
Psidium cattleianum	Myrtaceae	strawberry guava	OANRP	girdle	20% G4, 80% Biodiesel	more than moderate satisfaction	large trees, above 3" diameter trunk	MESIC		OBSERVED	2018-04-24
Psidium cattleianum	Myrtaceae	strawberry guava	WMWP	girdle	20% G4, 80% Biodiesel	more than moderate satisfaction	large trees, above 3" diameter trunk	MESIC		OBSERVED	2018-04-24	+
Psidium cattleianum var. lucidum	Myrtaceae	strawberry guava	CTAHR/OANRP	IPA-Incision Point Application	100% Milestone	successful. Recommended method	trunk circumference 50-80cm	MESIC		TRIAL	2018-04-23	+
Psidium cattleianum var. lucidum	Myrtaceae	strawberry guava	CTAHR/OANRP	IPA-Incision Point Application	100% Ranger Pro	unsatisfactory results	trunk circumference 50-80cm	MESIC		TRIAL	2018-04-23	+
Psidium cattleianum var. lucidum	Myrtaceae	strawberry guava	CTAHR/OANRP	IPA-Incision Point Application	100% Garlon 4 Ultra	moderate satisfaction	trunk circumference 50-80cm	MESIC		TRIAL	2018-04-23	+
Psidium cattleianum	Myrtaceae	Strawberry guava	NEPM	cut-stump	25% G4, 1% Milestone, 74% Crop oil	successful. Recommended method	large trees	MESIC	no use near waterways/streams		2018-10-17	+
Psidium cattleianum	Myrtaceae	Strawberry guava	NEPM	cut-stump	50% G4, 1% Milestone, 49% Crop oil	more than moderate satisfaction	large trees	WET	no use near waterways/streams		2018-10-17	+
Psidium cattleianum	Myrtaceae	Strawberry guava	NEPM	basal-bark	25 G4, 5% Milestone, Crop oil dilution	more than moderate satisfaction	up to 5in dbh	MESIC	small trial = 3 trees	TRIAL	2018-10-17	+
Psidium cattleianum	Myrtaceae	strawberry guava	KMWP	IPA-Incision Point Application	50% G4, 5% Milestone	more than moderate satisfaction	larger trees greater than 3cm in basal diameter	MESIC		TRIAL	2018-02-26	+
Psidium cattleianum	Myrtaceae	strawberry guava	KMWP	IPA-Incision Point Application	25% G4, 1% Milestone	successful. Recommended method	Small trees up to 3'' diameter	MESIC		TRIAL	2016-02-23	+
Psidium cattleianum	Myrtaceae	Strawberry guava	CTAHR/NEPM	IPA-Incision Point Application	100% Milestone	successful. Recommended method	med	MESIC		TRIAL	2015-03-04	+
Psidium cattleianum	Myrtaceae	Strawberry guava	CTAHR/NEPM	IPA-Incision Point Application	100% Polaris	unsatisfactory results	med	MESIC		TRIAL	2015-03-04	+
Psidium cattleianum	Myrtaceae	Strawberry guava	CTAHR/NEPM	IPA-Incision Point Application	100% G4	more than moderate satisfaction	med	MESIC		TRIAL	2015-02-26	+
Psidium cattleianum	Myrtaceae	Strawberry guava	CTAHR/NEPM	IPA-Incision Point Application	100% Round UP	unsatisfactory results	med	MESIC		TRIAL	2015-02-26	+
Psidium cattleianum	Myrtaceae	strawberry guava	OANRP	basal-bark	20% G4, 80% Biodiesel	more than moderate satisfaction				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.