Posted: 15/09/2013 at 09:22
I wash all my brassicas in salty water before cooking, to make all the caterpillars float to surface.
If you use salt on them while they are still in the ground, you will probably kill the plant.
If you can see caterpillars, pick them off. netting against the butterflies is the only way you will keep them free of caterpillars , unless you want to use a chemical spray. (Provado fruit and veg spray)