How do you make your own substrate for larvae food?

The composition of "processed forest products" varies greatly on region, so think about what sorts of trees you most frequently see being trimmed and cut down around your area. Bedding found in poultry litter is usually coniferous softwood such as pine since it's aromatic and repellent for many insects, making it unsuitable for use.

You do not need soil unless it's a species that requires soil-like substrates like those that are found in sandy environments. Most of the beetle larvae we rear do best if they are kept in a substrate that is 100% edible to them. Coconut coir that is fairly indigestible and inorganic soil components and additives are fillers that are entirely unnecessary and will do more harm than good. Peat is similarly unnecessary as it does not add nutrients and will further acidify the substrate.

If you are fermenting your own substrate, you need nothing but wood and a source of sugars--preferably starches instead of simple sugars. You won't need to add microbes, not even yeast, since it'll naturally get seeded by whatever is in the air. You can add a small amount of gypsum as a source of calcium in the substrate

If you are making your own substrate from rotten materials you can find, you only need to find some nice, rotten pieces of wood that you're able to crumble apart with just your bare hands and old leaf litter. Soak it in some boiling water for an hour or cook it to kill off any potentially harmful organisms that may be living in or on the wood and the leaf litter, crumble it into fine pieces with your hands or some other method, and it's pretty much ready for use. For Lucanidae, you can skip the leaves and use just the rotten wood. For Scarabaeidae, add a very large amount of non-aromatic deciduous tree leaf litter that's already started to break down. More leaves the better and in some cases, you barely need any wood as long as you have a good compost made up entirely of suitable leaves.

 
Yeah, that's the problem in south Florida... leaf litter is particularly hard to find here. I've got nothing but sandy pine flatwoods around and a few oak hammocks amongst the conifers. But these oaks are... different than your standard oak. Southern live oaks mainly. And I'm really not sure if their leaves are suitable for use as substrate. So what could I do just to try? Scoop up the top soil and leaf litter around an oak? But I would need loads of it.

No soil necessary? I've read some substrate guides saying that "organic compost" is good to use as an ingredient. But then again I get confused with all of these loosely-defined terms floating around. "Soil," "compost," "humus," "leaf litter," etc. I've definitely got a good supply of rotten wood, but it's just the leaves I really need.

Thank you so much for your input.

 
There are many types of compost. For example, you would not need a manure compost or worm casing compost and composts made of yard trimmings and food wastes can be used in some cases, but it's very dependent on what exactly you're composting as some materials would make the compost unsuitable for use.

A nice compost made up of leaf litter and little else is what you would want for rhinoceros beetles while mushroom compost would be good for stag beetles and some rhinoceros beetles.

 
Okay, I'll definitely give a good look through the compost available in my area. As well as collecting and sterilizing oak leaf litter. Thank you so much!

 
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