avoid auto-plagiarism in publishing results from PhD thesis
It would be better to cite your thesis as you would another work. You can list it in the bibliography as you would any other work, but mark it (unpublished). This is similar to citing the unpublished work of other people, and marking it as (private communication) just to make it clear. 

Of course, if your thesis is in (will be in) some publicly visible repository, then clearly you should cite it there. 

On the other hand, if you don't intend to publish your thesis, then the work you derive from it are original/first works and  you could, in theory, treat the thesis as a draft, in which case citation isn't really needed. But it could give the wrong impression if someone finds the thesis somewhere, such as a library repository. 

Note that the reason for avoiding self plagiarism is to let a future reader visit the complete context of a work. Simply reusing, rather than citing, your own words short circuits this.