What is an Anti-Insect Net? An anti-insect net (also called an insect barrier net or insect mesh net) is a lightweight, woven or knitted fabric made from durable materials like high-density polyethylene (HDPE). It is designed to physically block insects, pests, and birds from entering protected areas while allowing air, light, and water to pass through. These nets are widely used in agriculture (greenhouses, nurseries, open-field farming), horticulture, and even residential settings (e.g., window screens) to prevent pest infestations without relying heavily on chemical pesticides.