Plant quarantine regulations are enforced to prevent the introduction of foreign pests and diseases. This is done to protect domestic crops and the environment from the harmful effects of invasive species that could cause economic and ecological damage. These regulations are put in place to ensure that plants and plant products that enter a country or region are free from pests and diseases, or are subjected to appropriate measures to control or eradicate any such pests and diseases. This helps to maintain the health and productivity of agricultural crops and preserves biodiversity.