Fungus gnats
Fri, 25 Mar 2011 16:28:25 PDT
WRT to the "sand cuts the gnats and/or their larvae", the core idea is sound, 
but the implementation is flawed. It's diatomaceous earth that is an effective 
insecticide by virtue of scratching through an insect's waxy epicuticle, 
subjecting them to gradual desiccation and eventual death.

I'm not sure if this works on larval exoskeletons.

Rodger Whitlock
Victoria, British Columbia, Canada

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