Bug repellent

This spell creates a 1 foot field around the caster that repels any extra-Tiny flying, falling, or jumping creatures (flies, fleas, ticks, etc.), knocking them back out of the field.  In addition, any melee attacks made by Tiny flying creatures are made at a disadvantage.

The spell duration increases to 8 hours at 5th level, 12 hours at 11th level, and 16 hours at 17th level.