http://www.growsonyou.com/question/show/22342 found this from the archives, loads of info that might help.

The perfect answer, Cammomile. How do you remember how to find these old topics? I've heard of the miraculous neem oil, but couldn't remember its name. Has anyone used it? The other thing is, should you use horticultural soap (possibly extremely expensive) or will any old soap solution work?

Do you have Rape crops growing in fields within 5 miles of your garden ? The black Rape bugs are an awful nuisance.
Also White fly, which seems to increase as the winter goes on.
I am growing variety 'Early Half Tall' this year to get a crop in September, freeze them, then throw the old stems out before winter.

I doubt we have rape crops growing within 100 miles of us, Diane, and I've never noticed any white-fly, ever. I haven't heard of Early half tall. I usually grow Bosworth or Trafalgar for the taste, and to have a source of fresh greenery apart from leeks right through the worst days of winter. We have had wonderful crops off both and then, a couple of years back, they started being affected, along with all the rocket and radishes, so we just stopped growing those two, but I would be very sorry to lose my sprouts.

Is it just to make it 'stick' Gattina?
Washing up liquid could possibly work

They are all members of the Brassica family. A good idea to get some Derris dust, and sprinkle along the rows of seedlings to stop the Flea Beetle infiltrating the young growth. Trouble is it gets washed off when it rains so you have to do it again when it dries up. I think I have seen Liquid Derris, worth looking for.

In this area the farmers get told which crops to grow,
so there are always some huge fields of rape. The get their CAP money for sowing Rape seed.

Pam, washing up liquid would have been my first thought, too, but once you get on the internet, you can find such a range of advice, that there is always someone to tell you that washing up detergent or ordinary "wash your hands" type soap contains this, that and the other which is going to harm plants, or insect life, or the soil, and I get paranoid. I wouldn't mind paying a bit over the odds for "horticultural" or "agricultural" soap if it was going to make a real difference, but I rather doubt the claims of manufacturers charging high prices for what is a very basic product, after all.
Diane, surely Derris is off the market due to it's high toxicity levels? I certainly haven't seen it for years.

How about the eco range, I use is so it doesn't kill the septic tank

It's not something we've ever come across out here, Pam, but I'm sure it must exist.

Thats probably going to be expensive as well then. :0(

Hi Gattina there is a question today 12th april re soft soap and where to buy itvbon line, also sarraceniac says use organic washing up liquid