Annual Ragweed

Ragweed infestation. Small greenish flowers

Scientific name: Ambrosia artemisiifolia

Description

  • Annual erect herb growing up to 2.5 metres tall, colonising bare areas along roadsides, watercourse banks and degraded pasture
  • Fern-like pale to dull green leaves with soft hairs on the underside 
  • Small greenish flowers in spikes up to 20 centimetres on the upper part of the plant
  • Flower spikes appear yellow when mature.

Problem

Can trigger asthma when in flower.

Weed status - restricted matter category 3

Includes weeds, pest animals and noxious fish such as gambusia, dingoes and yellow crazy ants.

You must not distribute this restricted matter.

Due to its potential to cause serious economic, environmental or social harm, these weeds are regulated by Council.

We have an annual inspection program for properties in Logan.

Council has the authority to issue a Biosecurity Order to properties with category three restricted matter.

Control method

Foliar Spray

Herbicide is diluted with water at a specific rate, and sprayed over the foliage to point of runoff.

Most suited to shrubs, grasses and dense vines less than six metres tall.

Manual and Mechanical Removal

Manual control uses hands or hand tools to control weeds.

This can be an effective control as it can minimize soil disturbance and can instantly remove the entire weed.

Mechanical control suits larger infestations, using power tools and machinery to reduce the bulk of the problem.

Mechanical control can include slashing, mowing, dozing, harvesting, and felling.

Herbicide warning

Before using any herbicide always read the label carefully and ensure that the chemical is registered for use on the target weed. All herbicides must be applied strictly in accordance with the directions on the label.

More information