I use the yellow sticky strips.

Many previous control discussions here the search will pull up for you for more tips. I linked 1 of them below. As Jim said - yellow sticky traps, make your own traps using Tanglefoot, DE (diatomaceous earth), or one of the many soap-based insect sprays available on the market will help.

But in warm climates they tend to just keep coming back and one of the things that attracts them - other than the moisture - is excess nitrogen use on the plants. It's like a drug for them so take care with that.

https://www.gardenweb.com/discussions/1618907/whiteflies-what-really-works?n=13

Dave

Thank you! That link is very helpful.