What type of documentation should applicators keep for each pesticide used?

Applicators should keep application records for each pesticide used because these records provide critical information about the specific pesticides applied, including the date of application, the area treated, the amount used, and the weather conditions at the time of application. This documentation is essential for ensuring compliance with regulations and for tracking the efficacy and potential impacts of the pesticide treatments. Maintaining detailed application records also aids in following best management practices, allows for a thorough review of pest management strategies, and is important for providing information should there be follow-up questions regarding pesticide use or any issues that arise after application.

The other choices, while potentially useful in their own contexts, do not specifically address the comprehensive documentation needed for pesticide use. Financial records detail the costs associated with pesticide purchase but do not provide application information. Pesticide labels are important for understanding usage and safety; however, they do not serve the purpose of tracking what was applied where and when. Sales invoices confirm purchases but lack information regarding application practices or environmental considerations. Thus, application records are the most relevant and necessary documentation for pesticide use.