How to make substrate

Hello everyone. I'm new to keeping beetles and will be getting some D.grantis larvae in a few weeks. How do I make the substrate for them. I do have plenty of old trees were I live that I find bess beetles in so I think ill be ok on the rotting wood part. How does everyone make substrate. Thanks

 
i think it would be fine to feed that to D.Granti.

Just add some leaves and some organic compost

and you should be fine
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Also add some dog food and fish flakes as extra protein, to ensure larger specimens and hopefully some majors
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Hi
Fermented sawdust is very good for all Lucanidae and Dynastidae. You can do it yourself.
10L sawdust (oak, ash or beech)
0.5 kg of wheat flour
dry yeast 4 flat teaspoon
1L of water
Mix it all together and you have to stir it once a day. After one month sawdust turns dark brown or black. It's ready to use...
Very cheap and very simpleHi

 
I supplement my Dynastes granti and Dynastes tityus diets with a lump of wheat bran I've mixed together with boiled water buried at the bottom of the container. They dig to it within a couple of days and eat it as it decays.
It does grow a lot of tiny, transparent nematodes, but it has had no effect on my larvae and their numbers quickly dwindle after the wheat bran is gone. I've been fortunate in keeping mites out of my containers and this method had shown pretty good results for me.

 
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