What is a crucial factor for a pesticide to be approved for use?

For a pesticide to be approved for use, results from field trials and environmental impact assessments are essential. These trials provide data on the efficacy of the pesticide in controlling specific pests, while environmental assessments evaluate the potential effects on non-target organisms and the ecosystem as a whole. This rigorous testing ensures that the pesticide is safe for the environment and human health before it can be marketed and used. Regulatory agencies, such as the Environmental Protection Agency (EPA) in the United States, require this comprehensive evidence to ensure that any pesticide that enters the market does not pose significant risks to the environment or public health. Without this crucial data, the approval process cannot proceed, as regulatory bodies need to be assured that the pesticide meets safety standards and can be used responsibly.