if it was mites they would start on one plant and systemically move from plant to plant.

if you want to use something cheap and effective that is organically based try some bedding spray. you can find it at walmart or the grocery store. it's used for lice. it's active ingredient is permethrin, which is made from the chrysanthemum. it will knock out the thrips too.

it's safe to use (works great to get rid of mites on snakes) as it dissepates quickly in bright light. just don't breathe in the fumes. spray everything good and if need be spray again in a day or two.

on a side note, is your soil staying moist?


-shake