They may raise as many as 3 broods in a season. Certain management techniques should be practiced to help them along. You can open the house to check the nest once or twice a week without distressing the birds. Frequent house checks will allow for quick discovery of problems, and make your record keeping more accurate. Cleaning The House Clean the house before and after the nesting season and after each brood has left the nest.
Bluebirds build a new nest for each brood.
They will rebuild quicker if they have an empty cavity to nest in. They will sometimes refuse to use a house if it has an old nest in it, even if it is a nest they built. When they use a house with an old nest in it, they build a new nest on top of the old one. Other insects such as wasps can be removed physically, or controlled with pyrethrum spray or powder. Do not use rotenone after the eggs have hatched.