The don't have fliers...look I believe they have a symbiotic relationship with fungus gnats. I believe they catch rides with fungus gnats because they rely on fungus and decay as food. Bees get mites and transport them , this is not beyond imagination.
DON"T USE IMID , it makes mites lay more eggs.
Sulphur , malathion, pyrethium if you roots can handle it.
Sulfur kills every might even scabies in humans. These little fuckers due to them living in soil have had every pesticide we ever invented . Pyrethium knocks out eggs.
They use sulfur to keep the infestation out of bulbs, it always works but is less effective as a control.
Did a sulfur and malathion dip and it was the only thing that got rid of the crawlers...I am gonna follow with Met fungus and pyrethium once my root zone is healthier.