Encapsulation

A defensive reaction of an insect host to the invasion of parasites, mediated by its haemolymph. The parasite is imprisoned within a capsule formed by special host blood cells that cause the melanization and death of the invader. This may reduce the controlling effect of various parasitic Hymenopters attacking Coccoidea.

Reference

Blumberg, D. 1997. Parasitoid encapsulation as a defense mechanism in the Coccoidea (Homoptera) and its importance in biological control. Biological Control 8: 225–236.