My first shipment of corn worm parasitic wasps arrived 3 weeks ago. They need to go out to the field within 24 hours, so I ran over to the community gardens and distributed the four cards. Each card has pin head size wasp eggs glued to it. I searched through the plots and found about 10or 12 patches of corn. In four of them, I hung a card of eggs.
I am receiving more eggs about once a week and each time I place the cards in different patches.
The wasps parasitize the eggs of the European Corn Borer. Its an experiment to see if this helps with our worms. From looking back to my old photos (below), the worms I had two years ago were Corn Ear Worms, not Borers. My understanding is that the Ear Worm lays its eggs singly so its hard for a wasp to be effective against them because it has to find every egg. On the other hand the European Corn Borer lays eggs in a cluster, so the wasps can effectively parasitize all of them. It seem like a fantastic, organic method of pest control, so I am trying the experiment anyway.