When Jo Jensen talks about sleeper pests, she’s not exaggerating when she calls them “the problem no one sees coming.” These insects aren’t making headlines – yet. But as New Zealand’s climate warms, they’re poised to become a major threat to our crops and pastures.

Jo, an entomuniversiologist at the Bioeconomy Science Institute (formerly AgResearch), has spent years studying insects. Now, she’s diving deep into a PhD focused on sleeper pests – species that seem harmless today but could wreak havoc tomorrow.

Her research is a collaboration between the University of Waikato and Bioeconomy Science, giving her access to expertise far beyond her original team.

“I’ve always worked with incredible land-based science researchers,” Jo says.

“Partnering with Waikato academics means I can share the latest thinking between leading researchers from the Bioeconomy Science Institute and university who both share expertise in data modelling and plant physiology.”

Her current focus? The tropical armyworm.

Most people have never heard of it, but Jo warns it’s already here – lurking in the upper North Island. Most years, it’s quiet. But in warmer seasons, its population explodes, devouring pastures and broadleaf crops. And as temperatures rise, this pest will march south, causing even greater destruction.

Jo’s mission is clear: raise awareness and push for proactive planning. “If we wait until these pests become a crisis, it’ll be too late,” she says. “We need strategies now.”

This isn’t just about bugs—it’s about food security, farming livelihoods, and the future of New Zealand agriculture. Jo’s work is a wake-up call: the time to act is before the sleeper pests wake up.

Source: Universities New Zealand-Science New Zealand Newsletter