Cabbage Root Fly

Ive just read that digging over will make the pupae available for the birds reducing it ahppening so much next year, other than that I dont know

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If this is a real problem, whenever you plant brassicas, place a cardboard collar around the stem (a piece of flat card three or so inches square, into which you have cut a slit for the stem.) Fitted around the stem this means that the adult fly is less likely to lay her eggs there which hatch and descend to devour the roots.
I also find that mulching heavily around plants with a thick layer of straw or other fibrous compost largely prevents the fly. I don't know if this is because it alters the smell and the flies don't lay eggs, or whether the larvae can't penetrate the mulch. Or perhaps it attracts predators that eat the eggs and/or larvae.
Heavy mulching with straw is also a successful organic method for Colorado beetle on potatoes which we get frequently here, and it really works, again because it attracts predators.

Hi Flyingkites when growing vegetables it is good to practice a four year crop rotation as this helps to ensure any pests or diseases can't infect the crops from one year to the next. It also makes sense for other reasons... take a look at this page from my blog site for more info

http://intunewithmoon.findhornpress.com/?p=278

Thanks all for the info and Moon grower thanks for the link makes good reading.

You are welcome :-)