FAQ – How will we know whether the rust has been a success?

The monitoring programme (which will be initiated before release) will record the efficacy and spread of the rust within Himalayan balsam populations against baseline data. It should be highlighted that a natural control agent is not a quick fix solution and the rust will take time to build up within the population before it has an impact on Himalayan balsam. The desired effect of a natural control agent is to reduce the invasive population to a threshold below which it is having a high ecological and economic impact.