Yes, it probably, following the treatment, reduced the local abundance, but we only treated a few harbours where the species had been detected. The species must have been present in other areas. In the larval stage it can be carried by currents, and it's a big lake, so even if we had wanted to treat the whole lake, that would not have been possible. It took 33 cubic metres of liquid potash to treat these few harbours that had to be contained. Doing that for the entire lake would not have been possible.
On May 8th, 2019. See this statement in context.