Phylloxera

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Grape phylloxera (Daktulosphaira vitifoliae) is one of the most damaging grapevine pests worldwide. This tiny insect feeds on grapevine roots, disrupting its ability to take up water and nutrients.

Why grape phylloxera matters

For grapegrowers, the impacts of grape phylloxera extend far beyond the affected vines. A phylloxera detection can trigger quarantine and movement restrictions, increase operating costs, affect grape sales and require significant long-term investment in vineyard redevelopment. Research has shown that replanting an infested vineyard onto phylloxera-resistant rootstocks can cost up to $60,000 to $100,000 per hectare and may result in four to five years of lost production while the new vineyard reaches full bearing.

Unlike many vineyard pests, there are currently no practical chemical or biological controls available for grape phylloxera. Prevention and strong vineyard biosecurity therefore remain the most effective strategies for protecting vineyards.

Australia remains one of the few major wine-producing countries where phylloxera has been largely contained through strong biosecurity measures. However, the pest continues to pose a significant threat because most Australian vineyards remain planted on own-rooted Vitis vinifera vines, which are highly susceptible to damage.

Preventing the movement of phylloxera into uninfested regions remains critical. Phylloxera is currently confined to parts of Victoria and New South Wales, while South Australia, Western Australia and Tasmania remain recognised as phylloxera free. Effective vineyard biosecurity practices are essential to protecting individual businesses and the long-term sustainability of the Australian grape and wine sector.

Understanding the risk

Phylloxera spreads primarily through human activity. The most mobile life stage, known as a "crawler", can be carried between vineyards on:

machinery and equipment
vehicles and harvesters
grape bins
footwear and clothing
planting material
soil
harvested grapes and winery waste.

Research has demonstrated that phylloxera can survive on grapes, harvesting equipment, grape bins and even in some winery waste streams if appropriate hygiene and disinfestation procedures are not followed.

This means that everyday operational decisions, such as who enters the vineyard, where machinery has previously been used, and how visitors are managed, have a direct impact on vineyard biosecurity.

Lessons from the Yarra Valley

The Yarra Valley first detected phylloxera in 2006 and has since managed the pest through a combination of replanting on resistant rootstocks, surveillance and strict biosecurity measures. The experience highlights the importance of early detection, effective containment and long-term planning when managing phylloxera.

For affected growers, phylloxera has proven to be much more than just a vineyard pest. It can have significant financial, operational and personal consequences, requiring long-term business planning, investment and changes to vineyard management practices.

Watch the video below from Agriculture Victoria to hear directly from Yarra Valley producers about the impact of phylloxera and the lessons learned from managing the pest.

What growers can do today

The most effective defence against phylloxera is prevention.

Every vineyard should have practical biosecurity measures in place and ensure all staff, contractors, suppliers and visitors understand and follow them.

Key actions include:

restricting unnecessary vineyard access
maintaining visitor sign-in procedures and checking whether visitors have recently entered vineyards in Phylloxera Infested Zones (PIZs) or Phylloxera Risk Zones (PRZs)
understanding biosecurity risks associated with interstate movements of people, equipment and plant material
installing and maintaining vineyard biosecurity signage
cleaning and disinfecting machinery and equipment before entry
managing contractor movements between sites
ensuring visitor and contractor vehicles stay on designated routes and parking areas
cleaning and disinfecting footwear and small tools where required
sourcing certified planting material
training staff, contractors and casual workers in biosecurity procedures
monitoring vineyards for pest and disease symptoms.

Small lapses in biosecurity can create opportunities for phylloxera to spread. Consistent farm-gate hygiene and day-to-day biosecurity practices are essential for protecting individual vineyards and wine regions.

Designing vineyards for long-term resilience

While biosecurity remains the first line of defence, rootstock selection is an increasingly important consideration for long-term vineyard resilience and risk management.

Research supported by Wine Australia has developed and evaluated rootstocks with improved tolerance and resistance to pests, including grape phylloxera. Phylloxera-resistant rootstocks are the most effective available management option once phylloxera becomes established. In addition to helping manage phylloxera risk, rootstocks can be selected to address site-specific challenges such as soil conditions, water availability and vine performance objectives.

When planning new vineyard developments or replanting programs, growers should consider:

local pest and biosecurity risks
soil characteristics
water availability
vineyard performance goals
variety and rootstock compatibility
long-term vineyard resilience.

Use the Grapevine Rootstock Selector to compare rootstock characteristics and identify options suited to your vineyard conditions and production objectives.

Looking ahead

Australian research continues to improve understanding of phylloxera biology, detection methods and management options. Current work is investigating:

improved surveillance and early detection technologies, including environmental DNA (eDNA), LAMP diagnostics and remote sensing
more targeted rootstock recommendations through rootstock screening and improved understanding of phylloxera genotypes
improved quarantine, surveillance and disinfestation protocols
new diagnostic tools and national protocols to support biosecurity responses
strategies for the long-term management of phylloxera and the prevention of spread into uninfested vineyards and regions.

These advances will help strengthen Australia's ability to detect, contain and manage phylloxera, helping protect vineyards and the long-term profitability of the grape and wine sector.

Phylloxera Management Zones and movement requirements

Movement requirements for grapevine material, grapes, grape products, machinery and equipment vary between states and territories and are designed to prevent the spread of phylloxera.

Australia's wine regions are classified into Phylloxera Management Zones, including Phylloxera Exclusion Zones (PEZs), Phylloxera Risk Zones (PRZs) and Phylloxera Infested Zones (PIZs). Movement requirements differ between these zones, so growers should confirm the status of both the origin and destination region before moving regulated items.

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