If your opponent activates a Spell/Trap Card, then you may still Flip Summon etc "Naturia Rosewhip". During this turn, your opponent may activate one more Spell/Trap Card.[2]
References
↑Konami FAQ: When "Naturia Rosewhip" is face-up on the field, when the activation of a Spell Card is negated with "Magic Jammer" etc, can another Spell Card be activated?
↑Konami FAQ: When a Spell/Trap Card is activated before the effect of "Naturia Rosewhip" is applied, afterward can the opponent activate one more?