Blue dye, part of City’s new approach to glyphosate application


The City of Joondalup has started using blue marker dye with all glyphosate applications to make it easier for people to identify where the herbicide has recently been sprayed.

While glyphosate is approved for use in Australia by the Australian Pesticides and Veterinary Medicines Authority (APVMA), some members of the community have raised concerns about its application.

The blue dye is not classified as hazardous as per GHS classification*. Alongside advisory signage, it will give people the opportunity, should they choose, to avoid recently sprayed areas.

The City manages 533 hectares of bushland, many of which are recognised as having local and regional significance, more than 370 parks and 588 hectares of reserves – as well as a substantial number of urban landscaping areas.

Effective weed management is critical to ensuring the long-term protection of the City’s biodiversity assets.

More than 90 per cent of weed control within the City is managed using non chemical weed control methods.

Joondalup Mayor Albert Jacob said the use of marker dye was just one of several changes the City was making to its integrated approach to weed management.

“The blue dye will act as a visual reminder that glyphosate has been used in the area,” he said.

The City has been quick to implement changes to its integrated weed management program, as recently adopted by Joondalup Council.

  • Glyphosate use advisory signage is now left in place for a minimum of 24 hours, following its application.
  • Glyphosate is not sprayed within play spaces on City parks and reserves, or within 50 metres of schools, established childcare and community facilities (hired by playgroups);
  • The City continues to undertake weed control trials, both chemical and non-chemical, as new products and technologies become available.
  • The City is also working hard to implement further changes. These include:
  • A ‘no spray’ verge list will soon be developed in which property owners, childcare facilities and schools can register to have the verge(s) adjacent to their property exempt from chemical weed treatment. The City will notify schools and childcare facilities of this register.

(Inclusion on this list will be subject to the property owner maintaining the verge and keeping it weed free. Property owners will need to register annually).

  • An improved notification process will also be set up, where residents can be advised of upcoming scheduled chemical weed spraying activity as well as actual completed treatments.
  • A dedicated page on the City’s website – outlining information and maps on the intended chemical treatment schedule and completed chemical treatment schedule – will also be developed.

*Globally Harmonised System of classification and labelling of chemicals as required by SafeWork Australia.