White Flies & Caterpillars

[Pootle]

I've only just ventured into brassica territory (never again!) and having been pretty much pest-free until now on the plot we are faced with white flies on the underside of the leaves - does anyone have any suggestions for an organic way to get rid of them? And how do you prevent them coming back?

And while we're at it - what do you do about a 6 year old who won't let you squash cabbage white caterpillars and eggs? She hasn't worked out that they're threatening her Christmas sprouts and need to be 'exterminated' yet

[Two_Sheds]

White fly is repelled by French Marigolds ... interplant them with your brassicas.

My niece told me "never kill a living thing" - but she happily collects up caterpillars to feed to the chickens. It's recycling, see