If you have Jahiera in this battle, immediately cast Insect Plague. completely turns off all enemy spell casting. In fact, Jahiera's (or Cernd) Insect Plague spell will usually tip the scales in battle with tough spellcaster(s).
Also, the 7th level druid spell Insect Swarm is similar. Double damage in half the time. However, if your intent is to simply "turn off" an enemy's spell casting, Insect Plague is better. The duration of the spell is more important than the damage it causes.
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