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I had to resort to 'deris plus' which gave me a break from caterpillar picking and also sorted the whitefly. A fine mesh is the only certain answer however on the allotments many plotholders just leave there crops to be consumed thus exacerbating the problem by allowing the cabbage white populations to increase. The same goes for potato blight if people just leave the haulms to propagate spores. Gardeners should look after their crops or compost them?
The reason I found this blog was that I was Googling for information about when the Cabbage White butterfly stops laying eggs - i.e. when can I remove my netting?! - the plants are trying to burst out! Can anyone advise?