I don't know if it will work for these specific bugs, but I do know that some plant-eating bugs take great advantage of the fact that leafed plants of course have dry leaf undersides. So they will hang out on the bottoms of leaves, lay their eggs there, live there for generations, etc.
The trick is to just regularly spray the UNDERSIDES of the leaves, usually with a pump sprayer with the spray handle held upside down. Then you clear off the top inch or so of soil and throw it away; some bugs lay eggs in the soil. If your plants are potted, you can also invert the plant and dip the entire thing into a large bucket or garbage can of water. You can make a circular slitted cardboard cover for the pot, if you're afraid of dirt and such falling into the water bucket.
This free method of mechanical removal saves you from using pesticides (organic or not, they all have issues). Again, not sure if it will work for these bugs, but it's a good trick to know.

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