Try pure organic neem oil. I use it. Put 5ml of neem oil, 3 ml soap and 1 litre of warm water. shake it all up good in the bottle and spray everywhere. Put some down by the roots too. Be sure you put enough soap in the water to mix the oil well. Neem oil works by messing with the insects behaviour. Insects forget to eat, reproduce, larvae die and even eggs don't hatch, it kinda messes with their chemical signals. Some insects even forget that they can fly ! It works on lots of insect pest and is 100% organic. It isn't harmful to the plant and can even be put in the soil, it doesnt harm bees or earthworms etc. Just pests. Try it and see. But it doesnt work immediately as it take time for the insects to die from not eating and reproducing. Depending on the expected life cycle of the bug in question. Worth a try and your plants won't have any dangerous chemicals in them.