Besides meeting legal requirements, keeping records of pesticide usage is a wise precaution.
Records establish proof from damage claims.
Even the most careful applicators sometimes have a damage claim brought against them. It is important to know what kinds of records to keep as well as what kinds of claims are most commonly made against pesticide applicators. They also help find the cause of error, if an error has been made. The more data you keep on record, the more useful your records will be. Do not try to memorize everything.