Involved in the recognition of invading microorganisms. Binds specifically to beta-1,3-glucan and activates the phenoloxidase cascade (By similarity). Expressed at very low levels during embryonic development. Expression increases during the larva stages and peaks at a moderate level during the late larval, prepupal and pupal stages, before decreasing in the adult. Belongs to the insect beta-1,3-glucan binding protein family.