Sorry for the delay - I meant to post this right away. Here are some links showing pictures and methods of treatment. You'll see many people have had trouble eliminating these things... some going as far as cutting down and starting over.

Fungus gnats or WINGED ROOT APHIDS??? - International Cannagraphic Magazine Forums

Here's another thread that discusses them as well:

Phylloxera information - aka root mites aka root aphids - International Cannagraphic Magazine Forums
lampost Reviewed by lampost on . Phylloxera - Help us God! Phylloxera - Winged Root Aphid Anyone unfortunate enough to have a run-in with these little suckers! I can tell you straight up that they are worse than spider mites. Reading a little about them it seems they destroyed 9 out of 10 grape vineyards in France prior to 1900s... These bastards are just about impossible to eliminate from what I've heard. They are best fought with a systemic (imid?), however, it stays in the plant for a LONG time so it can really only be applied safely in Rating: 5