This spell kills any insects or swarms of insects within range that have a total of 25 hit points or fewer.
Using a Higher-Level Spell Slot. When you cast this spell using a spell slot of 2nd level or higher, the number of hit points affected increases by 15 for each slot level above 1st. Thus, a 2nd-level spell kills insects or swarms that have up to 40 hit points, a 3rd-level spell kills those with 55 hit points or fewer, and so forth, up to a maximum of 85 hit points for a slot of 6th level or higher.