Insect netting is a protective barrier mesh usually made of woven poly. It is meant to exclude pests from valuable market crops, trees, and flowers. Pests can cause direct damage to the leaves and the fruits of crops, cause disease, and lead to lower yields.
Insect netting is designed to keep out pests, while still allowing for proper airflow and water permeability through the small mesh openings. The netting provides protection from insects, deer and rodents, and damage from weather.
The mesh varies in size depending on the insect that you wish to exclude or what pests are common in your area. Mesh is measured by the number of holes in one linear inch of the netting. A common size used for row crops is between 40 and 50 mesh.