Bear
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There is no chemical insecticide answer available to the home gardener so we must rely on organic prevention methods. For stemmed brassicas; cabbages, cauliflowers, broccoli etc the best method is to use a disc or square of barrier material. You can buy these or easily make your own by cutting a piece of carpet underlay about 15cm square, cutting a line to the centre and placing it around the stem of the plant. You may need to peg this to stop it blowing off. It is time consuming but effective.
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