Concerning treatments, the work on Work Package 2 (Improvement of non chemical treatment uses) revealed that one genetic group of a predatory mite was more voracious than the others, which opens up prospects for improvement. No incompatibility between plant-based treatments (or vaccine) and predators was found. Regarding resistance, significant differences in susceptibility to plant-based repellents were detected between PRM populations. Experiments are underway to determine the extent to which these variations may result in the selection of resistant populations under plant-based treatments. In the process, we have also discovered that the temporal dynamics of PRM populations is much more aggressive than previously thought.