Following Hortman's advice, I decided bag and capture whiteflies on the most infested plants. The first plant cut the pests in half. I then let the whiteflies migrate for a day or so to their next target of opportunity. Another bag and the tribe was really reduced.
The rout was on. The next phase was scouting out the last of the buggers. Any plant that looked like a target was yanked and put into the bag.
Now nearly a week later today's inspection finds only a few more to go. Here's hoping the next capture round is the last.