wildfire question.

wildfire have 2 fire icon in presence.
when add presence of wildfire to already 1 or more blight land, wildfire`s special power 'BLAZING PRESENCE' is add one blight.

in this way, blight is cascade (to adjacent land add one blight)??

Yes, when Wildfire causes Blight by adding Presence, you can cause a cascade in the situation you describe.