Prickly acacia is identified as a major environmental pest plant, that degrades soil by facilitating erosion and threatens biodiversity.

Seed from the invasive weed has spread across north west Queensland, following the unprecedented flooding in January 2019.

The Department of Agriculture said it has had renewed contractual arrangements with Agrifutures Australia to combat the invasive species.

"The Queensland Government continues to deliver on a $2.3 million biological control research program for prickly acacia and other invasive plants, including a $450,000 project for prickly acacia bio-control research," a Department of Agriculture spokesperson said.

"The host-specificity testing of a promising gall thrips has been completed at the EcoSciences Precinct in Brisbane.

"The gall thrips is a highly specific agent causing damage to prickly acacia under both laboratory conditions and field conditions within its native range.

"Two more potential agents for prickly acacia continue to be tested - a stem-galling fly in the Brisbane quarantine facility and a gall mite, under sub-contract, in laboratories in the Republic of South Africa."

"On September 21, the Queensland Government announced $5m for Round 5 of the Queensland Feral Pest Initiative, for additional exclusion fences in south west and central west Queensland to support the return of graziers to sheep production."

LNP shadow Agriculture Minister Tony Perrett condemned the Palaszczuk government's commitment to Queenslanders in eradicating the invasive species.

"Queenslanders won't forget the political treachery from Annastacia Palaszczuk's Labor Government who promised $5m for prickly acacia only to take it away," Mr Perret said.

"Labor has no budget and no economic plan for Queensland.

"Labor betrayed North-Western Queenslanders because they are anti-farmer and anti-regions.

"When it comes to issues affecting rural and regional Queensland, Labor continues to govern from Brisbane for Brisbane.

"Only a Deb Frecklington LNP Government will build a stronger economy so we can invest in proper weed management controls Queenslanders deserve."

Traeger MP Robbie Katter said the resourcing that the state government have applied is not consistent with the size of the prickly acacia problem.

"There is a pathway forward, the Katter Party's position is to incentivise the private landholders to take care of the problem themselves, because the government has shown they're not willing to do it," Mr Katter said.

"The answers now are that there is a lot of producers out there in this space and they'll spend up to $100,000 a year in dealing with those problems and the same landholders pay more than $30,000 a year in land taxes and pastoral lease rents.

"So there's an avenue for the government to provide land taxes and lease rent concessions for landholders that embark on control programs themselves."

Biosecurity Queensland has added six more high-risk invasive plant species to a list of plant species that have been eradicated from Queensland.

Biosecurity Queensland General Manager Invasive Plants and Animals Dr John Robertson said the plant species were major pests.

"Nipping grey willow, white willow, yellow fever tree, grey-haired acacia, thorn tree Acacia nigrescens and cactus Opuntia santarita in the bud is a great outcome that helps protect millions of hectares of grazing land from potentially invasive plants," Mr Robertson said.