Any process that activates or increases the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of ecdysteroids.
Synonyms:
exact_synonym:
positive regulation of ecdysteroid anabolism; positive regulation of ecdysteroid biosynthesis; positive regulation of ecdysteroid formation; positive regulation of ecdysteroid synthesis; up regulation of ecdysteroid biosynthetic process; upregulation of ecdysteroid biosynthetic process
narrow_synonym:
activation of ecdysteroid biosynthetic process; stimulation of ecdysteroid biosynthetic process