Involved in the recognition of invading microorganisms. Binds specifically to beta-1,3-glucan and activates the phenoloxidase cascade. Causes aggregation of invading microorganisms. Monomer. Fat body and hemolymph. Expression is maintained at a moderate level during larval feeding and wandering stages. N-glycosylated. Belongs to the insect beta-1,3-glucan binding protein family.