Yeah, what she said.

Also pyrethrins work well on flying pests.

To control reproduction of thrips and whiteflies, water some predatory nematodes into the soil. They attack the pests when they burrow into the dirt to lay eggs.
stinkyattic Reviewed by stinkyattic on . aphids n black fly hello folks, got an outdoor crop doing well apart from both aphid and black fly. I had the same problem last year and figured the amount of infestation was ok I also had no desire to put chemicals on them. the smoke was good. This year though the amount of them is much more and its only early and i am not sure if they are going to damage the plant, Do they really do much harm ? whats the non chemical way of getting rid ?...apart from blasting each group with water..... The daylight Rating: 5