UK
your best best is "ant stop granules" spinosad based
mix it up with water and spray the plants you can also water with it or put it in the drip trays
it lasts 10 to 16 days it`s a bactria
only thing to watch out for is root rot if you flood your plant to hell with out
Captain jacks dead bug or montgomery would be the kinda usa equivalent, Ant stop granules will throw even a bad case of thrips back to the stone age it kills almost any insects
Nematodes can work well in the summer times too they like the extra heat