Field rearing is done in field insectaries, which are small plots of land, generally about 10 acres, infested with leafy spurge. There, the insects are released and protected, so that they can grow and multiply with minimum stress. State cooperators collect offspring of the released insects to place in satellite insectaries in other locations around the State. The insects also disperse naturally. Leafy spurge enemies often are placed in protective field cages to help them become established.
Flea beetles can be mass reared and sent to the field in shipping cartons.