Pre-emptive weed strike

Technology lights way to pre-emptive weed strikes

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Early weed identification: NSW Department of Primary Industries scientists, Drs David Gopurenko, Hanwen Wu and Aisuo Wang have developed a field kit to identify invasive weeds in their early growth stages. Photo: supplied

Early weed identification: NSW Department of Primary Industries scientists, Drs David Gopurenko, Hanwen Wu and Aisuo Wang have developed a field kit to identify invasive weeds in their early growth stages. Photo: supplied

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A portable tool kit, with the power to identify the DNA of invasive weeds when they first appear in the landscape, could soon transform weed management.

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A portable tool kit, with the power to identify the DNA of invasive weeds when they first appear in the landscape, could soon transform weed management and land production.

Acknowledging that many landholders are not confident in absolutely identifying invasive weeds, Department of Primary Industries (DPI) scientists, David Gopurenko, Aisuo Wang and Hanwen Wu, have developed a field kit which uses LAMP technology to identify serrated tussock and Chilean needle grass in the field.

"The advantage of LAMP, the name given to loop-mediated isothermal amplification of DNA, is that we can quickly and easily identify trace amounts of leaf tissue within an hour at a cost less than $10 per test," Dr Gopurenko said.

"Early detection is the key to managing serrated tussock and Chilean needle grass."

The scientists realise weed seedlings and young plants are difficult to distinguish from similar looking native grasses and the development of this DNA-based tool will help accelerate their detection.

"When these weeds first emerge in new locations they often remain undetected until well-established and become difficult to control," Dr Gopurenko said.

"These invasive tussock grasses can quickly take over vast areas, competing with valuable pasture species.

"If land managers can detect these weeds when they first appear, control measures can be effectively initiated to get rid of the weeds before they become a huge problem."

In the past four months DPI has delivered workshops demonstrating the new tool to more than 150 biosecurity officers and land managers from NSW, ACT, Queensland and Victoria.

Further development of the technology could see the method modified for diagnostics of other target weeds, insect pests and pathogens.

Chilean needle grass, Nassella neesiana and serrated tussock, N. trichotoma, are introduced weeds, which cost more than $40 million annually in farm production.

  • Funded by the Australian Government through the Control Tools and Technologies for Established Pest Animals and Weeds Programme, administered by the Department of Agriculture, is based on outcomes from the NSW Government's Weeds Action Program.
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