We have put this together after requests from previous customers.
This advice applies to the 3 main casters available with some differences, these will be pointed out as necessary, the 3 casters are the large Blue Bottle, smaller Green Bottle and the small House fly.
When maggots are required to turn to casters they should be sieved off the sawdust and put into fine and already damp sawdust or peat, do not just add water to maggots already in sawdust or you may find the wet maggots are able to escape an open container, These should be kept at room temperature, it is a good idea to take off the casters every day or so, this is done by placing them on the sieve allowing the maggots to wriggle through, the casters that are retrieved should have any rubbish removed and the clean casters put back into damp sawdust, to slow the development keep them chilled, if flies are needed then keep some at room temperature, you will notice that the casters will continue to darken, when they are almost black they are close to hatching and should be moved into an enclosed container or you may find you have a room full of flies. The flies will hatch best when the casters are kept in damp sawdust.