When I saw my first cabbage white butterfly a while back I decided to net my brassicas in the hope that it would deter future cabbage whites. It didn't. I've been finding their eggs on the underside of leaves for many days now....on and off...and have resorted to inspecting the plants every day and squishing any new batches found.
Although they are very small, because they are bright yellow, they stand out very well against the dark leaves so are easy to spot. A bit laborious but as the little blighters are quite capable of stripping a leaf completely, well worth the effort. In a weird sort of way, it makes me glad that I only have a small patch to contend with. Never thought I'd hear myself say that!
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