Several of my brassicas (Cauliflower, Turnip, Kohl Rabi) have some
leaves with bright violent patches, see:

http://www.netservs.fsnet.co.uk/g/vi..._brassicas.jpg

I can't think it's a nutrient problem, the plot was spread with garden
compost last winter and they've been fed poultry manure pellets.

I've grown all these before but they normally stay a boring green.
Should I be worried?

Steve Harris - Cheltenham - Real address steve AT netservs DOT com
A useful bit of gardening software at http://www.netservs.com/garden/