Sowbugs and pillbugs general do little or no harm to plants. In large numbers they may feed on plants at ground level or on small roots, but the only real threat they present is that the feeding locations can provide openings for bacteria or fungi which could result in rot setting in.

How do I keep sow bugs from eating my plants?

Sow bug control near new and emerging seedlings may be accomplished with small amounts of diatomaceous earth around the plants. This keeps sow bugs in the garden away from growing plants. Sow bug control can also be accomplished by placing a cantaloupe open side down to lure the sow bugs away from other areas.

Are sow bugs destructive?

Sowbugs and pillbugs are closely related, but they are not insects. ... Rather, these arthropods are crustaceans, more closely related to shrimp and crayfish. In fact, they are the only crustaceans that have adapted to living their entire lives on land.