Declared plant control table

Page last updated: Wednesday, 19 September 2018 - 12:12pm

Please note: This content may be out of date and is currently under review.

A list containing links to descriptions and chemical controls for declared plants and a calendar of operation for declared and other trouble plants.

Declared plant control table

Click on the plant name to go to further information on that weed.

 

Plant

Germination

Rosette/
seedling

Flowering

Time to spray

Comments

Acacia

perennial

African rue

perennial

African thistle

winter

spring

spring-summer

spring

perennial

Alligator weed

reproduces vegetatively

summer

aquatic

Apple of Sodom

late spring

winter

Oct-Apr

spring-summer

perennial

Arrowhead

summer

aquatic annual

Artichoke thistle

autumn

winter

Nov-Dec

Sept-Nov

perennial

Arum lily

late autumn-winter

winter

Sept-Nov

June-Sept

summer dormant perennial

Bathurst burr

following spring-summer rains

summer

summer

early summer

summer growing annual

Bellyache bush

when moisture present

Blackberry

spring

summer

Dec-Apr

Jan-Apr

perennial

Boneseed

mostly autumn

winter

July-Aug

late winter-spring

perennial

Broomrape

Cabomba

Calotropis

wet season

Aug-Oct

when actively growing

perennial

Camelthorn

autumn or spring

spring

Nov-Dec

during active growth

perennial

Canadian pond weed

reproduces vegetatively

summer

aquatic perennial

Candle bush

Cape tulip (one-leaf)

May-July

winter

early spring

July-Aug  depends on herbicide

Cape tulip (two-leaf)

May-July

winter

spring

Aug-Sept

perennial  forms seeds and corms

Chinee apple

Cleavers

Cotton bush, narrow leaf

winter

Sept-Dec

Sept-Dec

perennial

Creeping knapweed

winter-spring

spring

summer

perennial, not known in WA

Devil's claw, purple flower

Devil's claw, small fruit

Doublegee

autumn

autumn-winter

winter

July-Aug

winter-growing annual

Field bindweed

spring rhizomes, autumn seeds

spring

Nov-Feb

Dec-Feb early flowering stage

perennial

Glaucous star thistle

winter

spring

Nov-Dec

seedling to early flowering

winter growing annuals

Golden dodder

Gorse

autumn-spring

most of year

Jan-Apr

perennial

Harrisia cactus

damp conditions

perennial cactus

Heliotrope

summer

summer

February

Dec-Apr

summer growing annual

Hoary cress

autumn

winter

spring

July-Aug

perennial

Horehound

autumn

winter

Oct-Mar

June-July

perennial

Horsetail

Hydrocotyl

Sept-Feb

Nov-Feb

perennial

Ivy gourd

wet season

dry season

tropical perennial

Kochia

Aug-Dec

Aug-Dec

Feb-May

Aug-May

annual

Lagarosiphon

usually reproduces vegetatively

summer

aquatic perennial

Leafy elodea

usually reproduces vegetatively

summer

aquatic perennial

Madagascar rubber vine

Mesquite

when soil moist

most of year

when actively growing

perennial

Mexican poppy

autumn-winter

winter

Oct-Nov

August

winter-growing annual

Mimosa

Mintweed

after summer rain

summer

summer

summer

summer growing annual

Nodding thistle

Noogoora burr

spring

summer

summer

before burr formation

summer-growing annual

Parkinsonia

wet season

usually May-June

when actively growing

perennial

Parrot’s feather

reproduces vegetatively

summer months

aquatic perennial in WA

Parthenium weed

when soil moist

mid-late summer

depends on moisture

annual

Paterson’s curse

autumn

winter

winter-spring

June-Aug germination to flowering

winter growing annuals

Penny cress

Perennial thistle

autumn

winter

summer-spring

Aug-Sept

perennial

Physic nut

Prickly pear

any time when soil moist

summer

when actively growing

perennial

Ragwort

autumn

winter-spring

Oct-March

winter-spring

perennial

Rubber vine

perrenial

Saffron thistle

autumn

winter

early summer

winter-spring to early flowering

winter-growing annual

Sagittaria

summer

aquatic annual

Salvinia

reproduces vegetatively

summer

aquatic annual

Senegal tea

Sensitive plant, common

wet season

summer

perennial

Sensitive plant, giant

during wet season

summer

perennial

Shield pennywort

Siam weed

Sicklepod (Senna obtusifolia)

Sicklepod (Senna tora)

Sida

wet season

Feb-April

Dec-Jan

annual

Skeleton weed

winter

spring

throughout summer

when actively growing

summer perennial

St John’s wort

autumn-spring

whole of 1st year

Nov-Feb

Oct-Nov

perennial

Stemless thistle

autumn

winter-spring

Oct-Nov

Aug-Sept

annual

Thornapple

after summer rain

summer

summer

Dec-Jan

annual

Three-horned bedstraw

Tutsan

Tutsan, flair

Variegated thistle

autumn-winter onwards

winter-spring

spring-summer

July-Aug

annual

Water hyacinth

spring

summer

February

summer

aquatic perennial

Water lettuce

usually vegetative in WA

aquatic perennial

Yellow burr weed

autumn

winter

spring

winter

annual

 

Contact information

Pest and Disease Information Service (PaDIS)
+61 (0)8 9368 3080