Proviso seems to keep them away but is not full proof you just have to keep an eye out for them they are very clever at hiding from you.

Neem oil does work on the grubs, but so does liquid soap spray. Not as deadly to Bees as Provado.

I’ll say thanks too, I think they are dessimating my zantedeschia. It’s a beauty with its white trumpet flowers..but hasn’t flowered in 2 years. I’ll try the liquid soap. This was a gift from one of my patients several years ago, I’d like it to keep going..

Lily beetles do not normally go on Zantedeschia so what ever is damaging your plant may well be something else.

Thanks all...prefer the liquid soap treatment....am being vigilant!

Thanks 0wdboggy, good to hear. Any thoughts? I’m stuck. I’ll have to do a bit of research.

Pose it as a separate question with a picture if you can.