I, like Mark, do not consider my operation to be "treatment-free," so I did not vote. I would like to point out, however, that integrated pest management (IPM) is generally defined with categories of control methods: mechanical control, cultural control, chemical control, biological control. For the purposes of IPM, "manipulations" of a system for the purposes of effecting control over a pest is considered a "treatment."
If you follow strict IPM definitions, everything suggested is a "treatment."
If by "treatment-free," you mean "no chemical applications made," the method is open to debate.