Fungus gnats

Thu, 24 Mar 2011 14:14:24 PDT
I use a layer of granite grit (used as poultry grit or roofing
grit) on all my seed pots. It does help keep the gnats from the
organic soil beneath, and it prevents the seeds from washing
when they are watered.

Vista CA

-----Original Message-----
[] On Behalf Of Stokman
Sent: Thursday, March 24, 2011 11:21 AM
Subject: [pbs] Fungus gnats

I don't know if it would be possible in a large commercial
operation but years ago I read that pouring a layer of sand on
top of the soil in a pot would eliminate fungus gnats,
reportedly because the sand cut up gnats or their larva, I'm not
sure which.  Can't beat that for organic,  My purely anecdotal
and sporadic observation is that it works, though the sand needs
to be periodically replenished if the pot is watered from the

zone 8/9, Sierra foothills

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