We decided to place use a fleece to cover the bed of carrots and parsnip, to keep the carrot fly from laying eggs near the roots. The larva of the carrot fly will tunnel into both roots, greatly reducing the edible yield. The fabric is held down around the edges by stones.
The small leaves can be seen through the woven fabric, which lets in air, water and most of the sunlight, but keeps out pests.
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