The contents of today’s post come from a previous post of mine which was written in July 2013; however I’ve included four new pictures. This post is about the Hatchet wasp.
We’ve always seen the Cockroach egg Parasitoid (Evania appendigaste) around our home. It is a parasitic wasp which is also called the Ensign wasp or Hatchet wasp.The Ensign wasp – which is black in colour, is distinctly known for its tapping/jerking tail which is really its metasoma.
This kind of wasp does not sting humans, it feeds mainly on the nectar of flowers or honey dew, and lives for approximately two weeks.
Although it is called the Cockroach egg Parasitoid, it is really the larvae of the Ensign wasp that feed on cockroaches. During its short adult lifespan, the female Ensign wasp finds a cockroach egg-case into which she inserts a single white egg. Once hatched, the larva develops inside the cockroach’s egg-case and devours all the roach’s eggs. At maturity the adult Ensign wasp escapes through a small round jagged hole it cuts in the egg-case.
I read that we could control at least 50% of the population of cockroaches if there was a mass release of these wasps, but I guess as humans, we prefer using insecticides.