To my knowledge diatomite doesn't kill insects. I have an Oeceoclades calcarata growing in diatomite, and it did nothing to stop ants from colonizing in the pot. Great way to grow this species though.
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Philip
Last edited by King_of_orchid_growing:); 12-16-2012 at 06:56 PM..
I think Diatomaceous Earth discourages slugs and other soft insects from crossing it, but, in my experience, does not kill them unless they site in it,w hich they're too smart to do !