Parasitic wasps

Parasitic wasp.  Maybe Anomalon ejuncidum

Parasitic wasp. Maybe Anomalon ejuncidum

Parasitic wasps are a gruesome lot.  There are many types.  Some are parasites to specific animals (mostly arthropods) while others may parasite a variety of animals.  I think the parasitic wasp above is Anomalon ejuncidum.  It’s a parasite of caterpillars and beetles… maybe even our precious ladybugs.  Most parasitic wasps lay eggs inside the host; the eggs hatch while the host is still alive and then eat their way out.

I thought this was pretty amazing (from http://en.wikipedia.org/wiki/Parasitic_wasp)

Some of these wasps help pest control in a rather sophisticated manner. Certain types of plants have compounds that work in part with the saliva of caterpillars. When the saliva of the caterpillar and the juices of the plant mix, a fragrance is emitted that certain parasitoid wasps are very attracted to. The parasitoid wasps then kill the caterpillars and often use the carcasses to lay eggs within. This is a form of mutualism between the plant and the wasp and works only when the fragrance from the plant and the saliva combine.

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Here’s one of my favorite sights to see.  I doubt you’ll see this in a non-organic garden.  A hornworm covered in parasitic wasp cocoons.  The tiny wasp paralyzes the hornworm and lays eggs inside its body.  The wasp larva hatch and feed, then exit to spin a cocoon on the outside of their host. Finally they emerge as adults and continue the cycle.  Awesome.

Parasitic wasp cocoons on tomato hornworm

Parasitic wasp cocoons on tomato hornworm

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