This amazing plastic mulch repels hungry, disease-carrying insects. The shimmering silver, high-density polyethylene plastic causes insects such as thrips, aphids, and white flies to avoid the area near your plants. Experiments have shown that Silver Mulch is as effective as regular pesticide applications for protecting tomatoes from thrips that transmit spotted wilt virus. Good for all types of plants. We use it regularly on all brassica crops. Best defense mustard plants have against flea beetles. A must in the organic garden.