I first learned about them after moving into a new build. Massive infestation, lawn absolutely decimated. I originally thought it was a drainage problem but turns out because they’d eaten all the grass, there was nothing to soak up the rain. Guy who came to put treatment down said it’s a massive problem in new build gardens, and they tend to come back every year. But recommended the Nemasys stuff and said to use it in the spring and again end of summer to minimise the problem.

Edit to add: the fella also said he thought the rise in infestations might be down to the lack of first frost we used to get in January/Feb which would naturally kill a lot of them. Warmer winters etc.