Mothballing

Mothballing vineyards

Mothballing is the practice of maintaining a non-producing vineyard with the minimum critical inputs needed to preserve vine health and vineyard infrastructure, while allowing a relatively rapid return to commercial production when market conditions, water availability or business circumstances improve.

For grape growers, mothballing is a business and vineyard management decision. It may be considered when fruit prices are unsustainable, demand is limited, water availability is constrained, or operating costs exceed expected returns. However, mothballing is not simply a matter of reducing inputs. Decisions made during mothballing can affect vine health, future productivity, fruit quality and the cost of returning the vineyard to production.

Why mothballing matters

Periods of market oversupply, drought, water restrictions and rising input costs have forced many growers to reconsider how they manage unprofitable blocks. Research has shown that growers often respond by reducing expenditure on irrigation, nutrition, pest and disease control, cover crops and vineyard upgrades. While these measures may provide short-term savings, they can also create longer-term risks if vineyard health is compromised.

The key challenge is maintaining vine viability and vineyard assets while controlling costs. A successful mothballing strategy aims to:

• Protect vine health and longevity
• Preserve productive capacity
• Minimise future recovery costs
• Retain flexibility to return to production quickly
• Reduce financial pressure during periods of low profitability

Before you decide to mothball

Every vineyard responds differently. The suitability of mothballing depends on factors such as:

• Vine age and health
• Variety and rootstock
• Water availability
• Pest and disease pressure
• Soil type and fertility
• Vineyard variability
• Trellis condition and infrastructure
• Business goals and timeframes

Industry experts involved in the Mothballing the Vineyard project emphasised that there is no single approach that suits every vineyard. Decisions should be based on the specific circumstances of each block and the expected pathway back to production.

Key principles for successful mothballing

Continue monitoring vine health

Even when a vineyard is not producing fruit, vines still require management. Monitoring should continue for:

• Water status
• Nutrition
• Pest and disease activity
• Weed pressure
• Vine vigour
• Trunk disease risks

Research into minimal-input viticulture highlights that reduced irrigation, nutrition or disease control can affect vine performance, fruitfulness and recovery if carried out for prolonged periods.

Maintain critical vineyard operations

While inputs may be reduced, completely abandoning management can create significant risks including:

• Increased weed burden
• Pest and disease build-up
• Deterioration of vineyard structure
• Reduced vine health
• Higher costs when returning to production

Industry participants involved in the project consistently identified "zero input" approaches as among the least practical options due to the long-term consequences for vineyard recovery.

Plan for recovery before mothballing

Before implementing any strategy, consider:

1. How quickly production may need to resume
2. The likely cost of vineyard reactivation
3. Labour requirements during recovery
4. The impact on future yield and fruit quality
5. Potential effects on neighbouring vineyards

The longer a vineyard remains in a reduced-input state, the more difficult and costly recovery may become.

Approaches and techniques designed to reduce crop load or vineyard costs

The project Mothballing the Vineyard – Actions & Impacts (Project Number: RT 05/01-4) examined a range of potential techniques designed to reduce crop load or vineyard costs while maintaining future production potential.

Minimal-input management

Minimal-input management focuses on reducing costs while maintaining essential vineyard functions.

Potential benefits include:

• Lower operating costs
• Retention of vineyard structure
• Preservation of future production options
• Flexibility to return to cropping

However, this approach still requires ongoing monitoring and management to prevent problems becoming more costly over time. Industry participants regarded this as one of the most practical approaches because it maintains control of vineyard performance while limiting long-term impacts.

Crop removal

Physical or chemical crop removal has been investigated as a means of preventing harvest and reducing production costs.

Potential advantages include:

• Reduced crop load
• Lower water demand
• Reduced disease pressure
• Preservation of vine structure

Potential disadvantages include:

• Increased vine vigour
• Additional management requirements
• Loss of flexibility if market opportunities emerge later in the season
• Uncertainty regarding long-term impacts of some techniques

Importantly, the project noted that some chemical approaches investigated in trials were not registered for use in winegrapes for mothballing purposes and therefore cannot be recommended as management practices. Growers should always ensure any chemical use complies with current registrations and label directions.

Severe winter pruning

Severe winter pruning was explored as a way to substantially reduce crop potential in the following season.

Potential benefits include:

• Reduced yield potential
• Maintenance of vine structure
• Opportunity to remove unproductive or diseased wood
• Relatively rapid return to production

Field trials found severe pruning to be one of the most effective methods for significantly reducing crop load while still allowing recovery in subsequent seasons.

However, growers should also consider:

• Increased vigour management requirements
• Trunk disease risks
• Additional pruning and retraining costs
• Potential impacts on vine balance

Practical considerations for day-to-day management

When managing a mothballed vineyard, growers should regularly assess:

References and resources

• The Mothballing the Vineyard project investigated the impacts of mothballing and evaluated a range of potential strategies to maintain vineyard viability during periods of oversupply.
• Murray Valley Winegrowers developed a practical factsheet and checklist summarising key mothballing considerations and vineyard assessment questions.
• The Australian Wine Research Institute has compiled a collection of articles examining mothballing strategies, costs and grower experiences.