First, a definition… Biology-online.org defines an invasive species as a “Non-native species disrupting and replacing native species. Black soldier flies are thought to have originated in the southeastern United states. If so, then they are non-natives, at least in other countries, but are they disrupting and replacing other species? Are BSF in Washington state or Connecticut non-native? I don’t claim to be an authority…
This do-it-yourself design is fairly simple to build, and I suggest that anyone who was thinking of building my bucket composter should build this unit instead. With a 5 gallon (19 liter) working capacity it’s larger than the bucket, and the ramp and drainage systems are much better.
This is nothing new in terms of BSF composter design but the use of concrete as a building material is new to me. I wanted to try concrete because of its water wicking properties and the effect that might have on the internal temperature of the colony. Concrete absorbs liquids like a sponge due to capillary action, and hopefully that will lead to enough evaporative cooling to have a noticeable effect.
A few days ago I went into Home Depot near my home to grab a nylon hose barb for a BSF composter I’m working on. I already had the other parts and only needed this one piece. When I got to that part of the store there was a young man and his father looking at fittings. They had someone from the store helping them and when asked what they were building, the son said “a black soldier fly composter”..
In this post I want to focus on one of the techniques I previously recommended because I think it has some significant advantages. I’m referring to using your household garbage cans (you might know them as “bins”) as the attractant, and then collecting the eggs for transfer to the BSF composter for hatching.