Spring Pest Pressure, El Niño Signals and Why Your IPM Program Must Shift Now

Spring has finally arrived across Australia, and with it comes a predictable shift in pest pressure that every facility should be preparing for. Your IPM program needs to be robust enough to carry you through the next three months, with a renewed focus on insect activity and the broader environmental signals—particularly the El Niño pattern being discussed across media platforms. Now is the time to ask: Has your IPM program been properly assessed, and has your pest control contractor begun communicating what to expect?

A strong IPM framework relies on trending—weekly, monthly, and season‑to‑season. Your own data should already tell a story about what happened in Spring 2025. Environmental trending is equally important, and when you look closely at previous El Niño events, the patterns are already emerging.

Expected Pest Activity This Spring and during El Niño.

• Termites migrating toward moisture sources

• Rodents and ants increasing beyond normal seasonal levels

• Spiders, including redbacks, shifting movement patterns

• Cockroaches, especially American and German species, adjusting behaviour and distribution

Historical El Niño cycles reinforce these expectations. The 2023/24 inland locust plague and the 2015/16 surge in termite aggregation (Coptotermes) and rodent clustering were all linked to El Niño‑driven environmental changes.

The last El Niño event produced locust activity that escalated to plague proportions. This year, media reports have already highlighted increased adult locust activity across the Mallee, Riverland, Flinders Ranges and Eyre Peninsula—clear early indicators that South Australia may face similar pressure again.Knowing what may emerge is your strongest defence. Certain pest species adapt quickly to El Niño impacts, and understanding where your facility may experience increased risk over the coming months is essential.

Mouse Activity: Why the Risk Is Rising Again

Mouse numbers are already increasing as breeding begins with the arrival of spring. Rapid crop growth across the agricultural sector provides abundant food sources that can sustain mouse populations and potentially drive them toward plague conditions.

We’ve seen this pattern before. In 2021, mouse populations built up along the Victoria–New South Wales border before spreading through Queensland, moving east to west, and then pushing downward through the Mid‑West region of NSW. Victoria experienced significant increases across the Mallee and toward Bendigo. Right now, the Darling Downs and Goondiwindi regions are reporting elevated mouse activity—another early indicator that aligns with historical trends.

If there’s one lesson from previous events, it’s that the signs often appear months before the problem peaks. No one wants a repeat of 2021, but the environmental signals suggest we should prepare rather than react. The 2021 plague caused an estimated $1 billion in national damage. In 2026, Western Australia has already reported around $50 million in ruined seeds and seedlings.

Reactive responses cost money, time, and operational disruption—staff retraining, emergency building works, and intensified pest control programs. And this time, reactive pest control will look very different. With new rodenticide restrictions now in place, second‑generation anticoagulants cannot be used externally for mouse control. Alternatives must be planned for. Has your pest control contractor explained what escalation looks like if a mouse plague reaches your facility?

What a Proactive Facility‑Level Process Should Look Like

• Start outside, not inside. QA teams should walk the building perimeter regularly. Over the next 3–6 months, most pest pressure—rodents, ants, crawling insects, flying insects, birds—will originate externally.

• Tighten site habits. Reinforce door policies, waste management, and hygiene behaviours. Pulse these regularly, not only during audits.

• Audit your building fabric. Identify and seal gaps, holes, and service penetrations to reduce entry points.

• Assess your surroundings. Review vegetation, fence lines, and external storage areas. Increased growth and clutter create ideal conditions for pests. Remove conducive conditions early.

• Engage your pest control contractor. Seek practical, site‑specific recommendations that reduce risk before it becomes a problem.

• Increase service visibility if you had issues in 2021. Past vulnerability is a strong predictor of future vulnerability.

• Review your annual Pest Risk Assessment. Did it consider El Niño impacts and mouse‑plague indicators?

• Stay informed. Local radio, regional news, and agricultural updates often provide early warnings long before pests reach metropolitan areas.

Habitual Habits: The Hidden Risk

Some of the highest‑risk behaviours on site come from routine shortcuts. Forklift drivers switching roller doors to manual mode to save a second or two. Staff propping open pedestrian doors for convenience. These habits are difficult to change because they follow the “line of least resistance”—especially when people believe they aren’t being monitored.

Entry points need more checks, more visibility, and more accountability. Small habits can create large vulnerabilities during high‑pressure seasons.

“Proactive Beats Reactive—Every Single Time”

The next 3–6 months will separate facilities that manage pest risk from those that chase it. Environmental triggers are already in motion, and the operational habits inside your building will determine how exposed you are when pressure peaks.

VM Pest Consulting & Training partners with sites that take risk seriously—sites that want clarity, structure and technical guidance before problems escalate. If your IPM program needs recalibration for Spring and El Niño conditions, now is the time to act.

Proactive beats reactive every time. Let’s make sure your facility is ready.