In general, who should pay for pest control in rental property?

Our tenants live our rental house for 2yrs, I am wondering who's responsible for house spray to kill unwanted pests. I don't remember that I see something like this in the rental contract.

I double checked our lease agreement.  "Maintenance and repair; rules. Tenan will, at its sole expense, keep and maintain the Premises and appurtenances in good and sanitary condition". I felt this is the closest statement, but I am not sure about this.

Can I use above statements as ground to refuse to pay for the pests control cost requested by our tenant. (We paid last year for pest control, now here comes the 2nd time)

Appreciate it for any inputs.

yh*****