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When is it safe to remove netting? I too was looking for the answer to this as the sprouts are being restricted by it. Apparently flying (and therefore laying) tails off during September, but doesn't completely cease until November.
A good indicator of Cabbage white numbers is the number feeding from my Lavender, they can't seem to resist it and when I see them I go out with my net, catch what I can and kill them. I'm even more inclined to do this since I took the net off my brassicas and found that the 'small white' caterpillers (the green ones) had eaten the hearts out of my Romanecu. It's war now!!! The numbers are however tailing off, which is just as well as the plants are now completely without protection. The problem is that my mesh isn't wide enough to cope with the height of fully grown Sprouts. I'll have to come up with a better plan for next year. In my opinion you need mesh about 3.6m wide to cope with a 4' wide bed with Brussels plants at the recommended spacing. Unfortunately I thought that 2.6m width would be enough.