Home
About Us
Weeds
Weed Alerts
Declared Noxious Weeds
Herbs
Artichoke thistle
Bathurst/Noogoora burr
Black Knapweed
Blue Hound's Tongue
Branched broomrape
Buffalo Burr
Burr ragweed
Chinese violet
Crofton Weed
Devils Claw Purple flowered
Devils Claw Yellow flowered
Fireweed
Golden thistle
Hawkweeds
Hemlock
Horehound
Long-leaf willow primrose
Mexican poppy
Mistflower
Nodding Thistle
Parthenium Weed
Paterson's Curse or Salvation Jane
Perennial Canada Thistle
Perennial Ragweed
Scotch, Illyrian & Stemless Thistle
Silver Leaf Nightshade
Soldier thistle
Spotted Knapweed
St Johns Wort
Star Thistle
Vipers Bugloss or blue weed
Wild Radish
Witchweed
Trees
Grasses
Shrubs
Vines
Aquatic
Noxious Weeds Act
Plans and Strategies
News
Links
Weed Resources
Contact
 

Bathurst/Noogoora burr

Bathurst Burr

Bathurst burr fruits

Noogoora burr

Datura



BOTANICAL NAME:

Xanthium spinosum, Xanthium occidentale, X. orientale


Family:

Asteraceae (daisy family)

Status:

All three Xanthium burrs are declared noxious in the Southern Tablelands and South East Region in all LCAs except for Illawarra, in class 4.

Description

Bathurst burr is an erect annual herb usually about 1m high, single stemmed or branched. Narrow leaves have a downy white underside and a three-pronged spine at the base of each leaf. Flowers are inconspicuous, the female in the leaf axils and male flowers at branch tips. Two seeds are contained in each 10mm long spiny burr.

Similar weeds, Californian burr (X. orientale) and Noogoora burr (X. occidentale) have slightly larger burrs, and larger lobed and toothed leaves similar to a grape leaf in shape and rough to the touch. Noogoora burr leaves are paler green below with purplish veins and leaf stalk. Californian burr leaves are green on both surfaces. Neither has spines at the leaf base.

preferred habitat and impacts

These weeds prefer moist soil in full sun on grazing land, roadsides or waste ground. They are very widely distributed in eastern Australia, but less common on the coast than the inland. The burrs are one of the worst causes of vegetable fault in wool and cause discomfort to people handling sheep. Contact with the seed can cause dermatitis in some people. The plants compete for resources with summer crops and it acts as a host for fungal diseases of some horticultural plants. Seedlings are poisonous to livestock, the poisonous chemical being located in the seed and persistent in the seedling leaves.

Dispersal

Burrs attach to livestock or clothing and are spread in mud, soil and water.

Look-alikes

The weed, common thornapple (Datura stramonium) has a spiny seed capsule larger than that of the xanthium burrs and containing numerous seeds, not two. It also has large white trumpet flowers. It is also poisonous.

Control

Chip or spot spray prior to burrs forming. Once burrs have formed seed may mature even after plants have been cut. The cut plants will then need to be burnt. Selective herbicides can be used to remove them from pasture.