in taxon negatively regulates juvenile hormone biosynthetic process regulation of juvenile hormone biosynthetic process negative regulation of hormone biosynthetic process negative regulation of juvenile hormone metabolic process negative regulation of juvenile hormone biosynthetic process negative regulation of juvenile hormone biosynthesis down-regulation of juvenile hormone biosynthetic process negative regulation of juvenile hormone synthesis inhibition of juvenile hormone biosynthetic process downregulation of juvenile hormone biosynthetic process negative regulation of juvenile hormone formation GO:0045968 down regulation of juvenile hormone biosynthetic process Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of juvenile hormone. negative regulation of juvenile hormone anabolism negative regulation of lipid biosynthetic process biological regulation