safari filling in passwords when it shouldn't

Safari's filling in an e-mail and password for a web form where it shouldn't. It's being triggered by seeing the terms "password" and "email field" in the text alongside the form boxes. The password field's not for the password that Safari thinks belongs there, and the "email field" is actually for the field name where e-mail addresses are stored in a database.

How do you signal to Safari that this particular page is to be exempted from auto-fill?

I still want Safari to auto-fill my login details for the site, just not for this page.

The page is served by a web database and I don't see an obvious way to tell Safari what's different between this page and the site login page, nor how to tell Safari about things like that.