Here is some additional help. For the mealybugs, I found the following sites that could help.

http://www.planetnatural.com/site/xdpy/kb/mealybug-control.html

http://www.ipmofalaska.com/Files/mealybugs.html

http://www.mda.state.mn.us/biocon/plantscape/mealybugs.pdf

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Here is some info for controlling whiteflies.

http://www.planetnatural.com/site/xdpy/kb/whitefly-control.html

http://pubs.caes.uga.edu/caespubs/pubcd/b1077-w.html

http://www.mda.state.mn.us/biocon/plantscape/whitefly.htm

I hope these help.

Thanks for the info from you all. I posted also about bugs on my Crotons, which turned out to be mealy bugs. And, I have white flies! I have tried several things but the little buggers seem to keep coming back. I'm thinking maybe artificial plants for our pool cage would be easier to maintain! Some you can't even tell are not real until you get right up to them. But I'd know...Sigh. Guess I'll keep trying!

I had whiteflies a couple of times earlier this season, and I sprayed with Pantene clarifying shampoo and liquid seaweed in water with a pressure sprayer. It worked very well for me (much better than I expected). I used a good "squirt" of the shampoo and the liquid seaweed per bottle instructions.
Mrs H

I've had good luck controlling infestations using diluted fish emulsion. I dilute it according to the directions on the bottle and completely saturate the plants, making sure I get the undersides of the leaves. I spray once a month early in the morning. Not only does it control the bugs, it's a good foliar feeding. In between using the FE I just spray water on the plants with a hose.
Karyn