C'tis miasma and growth scales

[Yrkoon]

Hi, I am in a SP game playing MA C'tis (miasma dominion) and I have taken a growth scale.

I read somewhere that good scales apply only within one's own dominion, so presumably growth only applies to me. Does that mean that the miasma will affect my enemies more than my own non-lizard troops ? Will my, say, indie archers, get rarely diseased while enemy archers will die of disease often ? Or is the likelihood of getting diseased independent of growth scale?