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RAW, No.

Usually, we interpret spells assuming a “spells do only what they say they do” principle. Since insect plague doesn’t assign any of the appropriate statistics or give any end conditions involving the insects taking damage, we can say that damage from a fireball doesn’t affect the insect. They are magic bugs, after all.

As an example of what such an end condition would look like, the Staff of Swarming insects has a helpful example:

Insect Cloud. While holding the staff, you can use an action and expend 1 charge to cause a swarm of harmless flying insects to spread out in a 30-foot radius from you. The insects remain for 10 minutes, making the area heavily obscured for creatures other than you. The swarm moves with you, remaining centered on you. A wind of at least 10 miles per hour disperses the swarm and ends the effect.

The DM may rule otherwise.

Intuitively, it may make sense that something like a fireball centered on an insect plague should destroy the insects, and this wouldn't be an entirely unreasonable ruling. If my players thought of this plan, I would almost certainly let it happen because of rule of fun and rule of cool.

RAW, No.

Usually, we interpret spells assuming a “spells do only what they say they do” principle. Since insect plague doesn’t assign any of the appropriate statistics or give any end conditions involving the insects taking damage, we can say that damage from a fireball doesn’t affect the insect. They are magic bugs, after all.

As an example of what such an end condition would look like, the staff of swarming insects has a helpful example:

Insect Cloud. While holding the staff, you can use an action and expend 1 charge to cause a swarm of harmless flying insects to spread out in a 30-foot radius from you. The insects remain for 10 minutes, making the area heavily obscured for creatures other than you. The swarm moves with you, remaining centered on you. A wind of at least 10 miles per hour disperses the swarm and ends the effect.

The DM may rule otherwise.

Intuitively, it may make sense that something like a fireball centered on an insect plague should destroy the insects, and this wouldn't be an entirely unreasonable ruling. If my players thought of this plan, I would almost certainly let it happen because of rule of fun and rule of cool.

RAW, No.

Usually, we interpret spells assuming a “spells for only what they say they do” principle. Since insect plague doesn’t assign any of the appropriate statistics or give any end conditions involving the insects taking damage, we can say that damage from a fireball doesn’t affect the insect. They are magic bugs, after all.

As an example of what such an end condition would look like, the Staff of Swarming insects has a helpful example:

Insect Cloud. While holding the staff, you can use an action and expend 1 charge to cause a swarm of harmless flying insects to spread out in a 30-foot radius from you. The insects remain for 10 minutes, making the area heavily obscured for creatures other than you. The swarm moves with you, remaining centered on you. A wind of at least 10 miles per hour disperses the swarm and ends the effect.

The DM may rule otherwise.

Intuitively, it may make sense that something like a fireball centered on an insect plague should destroy the insects, and this wouldn't be an entirely unreasonable ruling. If my players thought of this plan, I would almost certainly let it happen because of rule of fun and rule of cool.

RAW, No.

Usually, we interpret spells assuming a “spells do only what they say they do” principle. Since insect plague doesn’t assign any of the appropriate statistics or give any end conditions involving the insects taking damage, we can say that damage from a fireball doesn’t affect the insect. They are magic bugs, after all.

As an example of what such an end condition would look like, the Staff of Swarming insects has a helpful example:

Insect Cloud. While holding the staff, you can use an action and expend 1 charge to cause a swarm of harmless flying insects to spread out in a 30-foot radius from you. The insects remain for 10 minutes, making the area heavily obscured for creatures other than you. The swarm moves with you, remaining centered on you. A wind of at least 10 miles per hour disperses the swarm and ends the effect.

The DM may rule otherwise.

Intuitively, it may make sense that something like a fireball centered on an insect plague should destroy the insects, and this wouldn't be an entirely unreasonable ruling. If my players thought of this plan, I would almost certainly let it happen because of rule of fun and rule of cool.

RAW, No.

Usually, we interpret spells assuming a “spells for only what they say they do” principle. Since insect plague doesn’t assign any of the appropriate statistics or give any end conditions involving the insects taking damage, we can say that damage from a fireball doesn’t affect the insect. They are magic bugs, after all.

The DM may rule otherwise.

Intuitively, it may make sense that something like a fireball centered on an insect plague should destroy the insects, and this wouldn't be an entirely unreasonable ruling. If my players thought of this plan, I would almost certainly let it happen because of rule of fun and rule of cool.

RAW, No.

Usually, we interpret spells assuming a “spells for only what they say they do” principle. Since insect plague doesn’t assign any of the appropriate statistics or give any end conditions involving the insects taking damage, we can say that damage from a fireball doesn’t affect the insect. They are magic bugs, after all.

As an example of what such an end condition would look like, the Staff of Swarming insects has a helpful example:

Insect Cloud. While holding the staff, you can use an action and expend 1 charge to cause a swarm of harmless flying insects to spread out in a 30-foot radius from you. The insects remain for 10 minutes, making the area heavily obscured for creatures other than you. The swarm moves with you, remaining centered on you. A wind of at least 10 miles per hour disperses the swarm and ends the effect.

The DM may rule otherwise.

Intuitively, it may make sense that something like a fireball centered on an insect plague should destroy the insects, and this wouldn't be an entirely unreasonable ruling. If my players thought of this plan, I would almost certainly let it happen because of rule of fun and rule of cool.