I'm afraid of spraying with pesticides
 

In my hydroponics system, I'm growing basil. We have a major whitefly problem. I'm afraid of spraying with organic pesticides because the leafs will go black. How do I get rid of the whiteflies organically???

The only real safe way is with predator mites ( Encarcia Formosa) that lay there eggs in whitefly larvae. But you have to introduce them to your garden early and a lot of them to be effective.
Or just use Safer Soap bug spay and yellow sticky traps like I do.