[robinahood]

Never seen so many, the air is full of them! I see the forecast mentions a possibility of frost in a couple of weeks, will this kill them off?

[Puenktchen]

Not really, it never worked for me. White flies seem to survive a normal winter, they are bit less active after a frost but most survive. I gave up growing kale as the leaves were always covered in the flies and their residues and I did not like the idea of eating this.
Red cabbage seems to be fine and kohlrabi as well so I grow these instead now.