Information
In this series, our Senior Researcher Phytopathology Manus Thoen takes on the myths that spread just as fast as the virus itself. Together with experts from our breeding, diagnostics, pathology, and molecular biology departments, he unpacks common misconceptions about HREZ, Enza Zaden’s High Resistance to ToBRFV.
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In this bonus episode, Manus Thoen (Senior Researcher Phytopathology) addresses the belief that using a ToBRFV‑resistant (HREZ) scion alone is enough to protect the crop. While this may seem logical, the video explains that resistance does not work in isolation but as part of the entire plant system. Both the scion and the rootstock play a role in how the plant responds to virus pressure. Relying on only one component can leave gaps, whereas combining resistant scion and rootstock creates a more complete and stable defence.
From a research and breeding perspective, Emiel Dijkstra (Tomato Breeder) explains how rootstock breeding contributes to this system approach. He highlights the role of the rootstock in supporting plant resilience and influencing how the plant handles virus pressure below ground. His insights show that resistance is not limited to one part of the plant, but depends on how different components work together.
From a market and grower perspective, Mike Lemmen (Global Portfolio Manager Tomato) translates this into practical value. He explains the added value of HREZ rootstock for growers, showing how combining resistant scion and rootstock leads to more reliable crop performance. Always combined with hygiene, this leads to better control of virus pressure in the greenhouse. Together, they reinforce a clear message: combining strengths across the plant system, next to strict hygiene measures, helps growers get the most out of HREZ.
Strong decisions start with solid information. By combining what we know from breeding, research and agricultural practice, this series cuts through the noise and highlights what truly matters for managing ToBRFV in modern tomato production.