From September to April each year, Australia implements seasonal measures for brown marmorated stink bug (BMSB) on imports from high-risk countries. For the 2026-2027 season starting September, those measures are expanding again — more countries, stricter requirements, longer target risk period.

If you’re importing vehicles, machinery, outdoor goods, or shipping containers from affected regions, the compliance burden just increased. Here’s what’s changing and why.

What Is BMSB and Why It Matters

Brown marmorated stink bug is an agricultural pest native to Asia that’s spread globally through international trade. It feeds on over 300 plant species including fruit trees, vegetables, and ornamental plants, causing significant crop damage.

Australia doesn’t have established BMSB populations yet. The Department of Agriculture’s border surveillance has intercepted thousands of individual bugs over the past decade, mostly on shipping containers, vehicles, and machinery arriving from the Northern Hemisphere during their autumn months (our spring).

If BMSB establishes here, the economic impact on horticulture would be substantial. Estimates range from $500 million to several billion annually in direct crop damage, control costs, and trade restrictions on Australian exports.

What’s Changing for 2026-2027

The seasonal measures target risk period is extending from the traditional September 1 - April 30 window. For imports from Europe, the period now starts August 15 and extends to May 15.

Why? Climate change is shifting BMSB seasonal patterns in the Northern Hemisphere. Warmer autumns mean the bugs remain active longer before overwintering, expanding the window when they might seek shelter in shipping containers and cargo.

Two additional countries — Greece and Hungary — have been added to the high-risk list. BMSB populations in these countries have established over the past three years, and interceptions from these origins have increased.

The list now includes: USA, Canada, Italy, Switzerland, Austria, Czech Republic, France, Germany, Hungary, Greece, and parts of Northern China.

Affected Goods Categories

Not everything from high-risk countries requires treatment. The measures target goods with high hitchhiker risk:

Vehicles and machinery: Cars, buses, trucks, construction equipment, agricultural machinery. These provide numerous harbourage sites where BMSB can hide during transport.

Outdoor goods: Camping equipment, outdoor furniture, barbeques, garden equipment. Anything stored or used outdoors in high-risk countries during risk season.

Shipping containers: All empty and refrigerated containers, plus sea containers with goods from risk countries, require inspection or treatment.

Stone and slate: These materials sometimes harbor BMSB in cracks and crevices.

Regular consumer goods shipped in air freight containers or manufactured goods sealed at factory aren’t typically affected. The risk comes from items exposed to outdoor environments where BMSB aggregates.

Compliance Options

Importers have three pathways to meet the seasonal measures:

Offshore treatment: Goods are fumigated or heat-treated at origin before shipment. Treatment must be conducted by DAFF-approved providers using approved protocols. A phytosanitary certificate documenting the treatment must accompany the goods.

Onshore treatment: Goods arrive in Australia and undergo treatment at approved facilities before release. This adds time and cost, but it’s an option when offshore treatment isn’t feasible.

Onshore inspection: For certain goods categories, an inspection by DAFF or approved inspection provider can clear goods if no live BMSB is detected. This is cheaper than treatment but riskier — if BMSB is found, the goods must be treated or re-exported.

The choice depends on goods type, cost considerations, and time constraints. For high-value vehicles and machinery, offshore treatment is usually preferred despite the cost.

Cost Implications

Treatment costs vary by method and goods type. Fumigation of a standard 20-foot container typically costs $800-1,500 offshore, $1,200-2,000 onshore. Heat treatment is more expensive but doesn’t require chemical exposure, which some goods require.

For individual vehicles, treatment costs $300-600 offshore depending on size and location. Onshore treatment is higher, often $600-1,000 per vehicle.

These costs add up significantly for businesses importing multiple containers or vehicles monthly. A company bringing in 50 vehicles over the season faces $15,000-30,000 in BMSB compliance costs alone.

Documentation Requirements

Proper documentation is essential. For offshore treatment, you need:

• Phytosanitary certificate issued by the exporting country’s plant protection authority
• Treatment details including method, chemical used (if fumigation), temperature achieved (if heat treatment), and duration
• Unique identifier linking the certificate to specific goods
• Container or vehicle identification numbers

Missing or incorrect documentation means goods can’t clear border inspection. They’ll be held pending proper documentation, onshore treatment, or re-export. All of which costs more time and money.

Supply Chain Timing Impacts

Even with proper documentation, BMSB season adds clearance time. Border inspection priorities shift toward hitchhiker pest screening. Containers and vehicles from high-risk countries receive more scrutiny, which means longer processing times.

Budget an extra 2-5 days for clearance during BMSB season compared to off-season imports. For businesses with just-in-time inventory systems, this requires planning and buffer stock.

Some importers shift purchasing patterns to bring goods in outside BMSB season when possible. But for many products — particularly vehicles and machinery — timing can’t always be controlled.

Why The Measures Are Getting Stricter

Climate change is one factor. Warmer temperatures are expanding BMSB’s range and altering its seasonal behavior, making risk predictions less reliable.

Trade volumes are another. Australia’s imports from Europe and North America have increased significantly over the past decade. More cargo means more opportunities for BMSB introductions.

The biggest driver is that the measures are working. Interceptions at the border remain high, demonstrating that without seasonal measures, BMSB would likely establish. That success justifies maintaining and strengthening the program.

Industry Consultation Concerns

Not everyone is happy about the expanded measures. The automotive and machinery import sectors argue that the costs are disproportionate to the actual risk, particularly for goods that have been stored indoors or shipped outside peak BMSB activity periods.

There’s also frustration about the one-size-fits-all approach. A vehicle shipped from Detroit in March (when it’s still freezing and BMSB isn’t active) faces the same requirements as one shipped from Italy in October (when BMSB is actively seeking overwintering sites).

Risk-based approaches that account for actual seasonal conditions at origin, rather than calendar dates, would be more efficient. But they’re also more complex to administer and verify.

Some organizations working with advisors in business process automation have developed systems to track origin-specific risk periods and optimize shipment timing, but this isn’t accessible to smaller importers.

What Importers Should Do

Plan early: If you’re importing affected goods, build BMSB compliance into your procurement and shipping processes. Don’t assume your supplier or freight forwarder will handle it — verify arrangements explicitly.

Choose offshore treatment when possible: It’s usually cheaper and faster than onshore treatment, and it doesn’t tie up goods at the border.

Work with experienced providers: Not all treatment providers are equal. Use DAFF-approved facilities with track records of proper documentation and reliable service.

Factor costs into pricing: BMSB compliance is a predictable cost during risk season. Include it in your landed cost calculations and pricing.

Consider timing flexibility: If your goods don’t require importation during BMSB season, shipping outside the target risk period eliminates compliance costs entirely.

The Longer Term Outlook

BMSB seasonal measures will likely remain indefinitely. The pest continues spreading to new regions globally, and its establishment in Australia would be extremely difficult to eradicate once it occurs.

Measures might eventually become year-round for some high-risk categories as BMSB seasonal patterns become less predictable with climate change.

Technology may improve compliance efficiency. Automated inspection systems using AI and computer vision could detect BMSB more reliably and quickly than manual inspections, reducing clearance delays.

But fundamentally, preventing BMSB establishment requires vigilance at the border, which means ongoing compliance requirements for importers from affected countries.

For businesses reliant on imports from Europe and North America, BMSB compliance is now a permanent cost of doing business in Australia. Understanding the requirements and building them into supply chain operations isn’t optional — it’s essential for avoiding costly delays and penalties.