Pesticide application records are:

Pesticide application records are essential for compliance with regulatory requirements and for promoting responsible pesticide use. The correct answer is that these records must be maintained for not less than two years. This duration allows for adequate tracking of pesticide use, which is crucial for evaluating its effects on human health, the environment, and non-target organisms.

Maintaining records for at least two years helps ensure that applicators can provide accurate information if needed for inspections or investigations related to pesticide usage. This is particularly important in the case of adverse effects or incidents that may arise from pesticide application.

The other options suggest shorter retention periods or conditions under which records might be kept, none of which meet the regulatory requirements set forth by agencies overseeing pesticide usage. The two-year duration reflects best practices in record-keeping, aligning with the need for accountability in agricultural and pest management practices.