With such a short lifecycle, you can see several generations per year in Maine. Trichogramma wasps have a wide host range. This means they can parasitize a great number of eggs belonging to a great number of species. They are indiscriminate parasites and can be hazardous to nontarget Lepidoptera. You must know the pest with which you're dealing.
Timing is critical in many cases.
Prey eggs have to be available since the wasps can't parasitize the larvae. This is just a small sampling of the insects that help control pests in your garden. For further information, check with your county Extension office. Your local farm supply store may have a list of beneficial insect suppliers. Prepared by Barbara Murphy, Extension Educator, University of Maine Cooperative Extension.