Thanks very much for the comments and ideas.
I have both neem oil and diatomaceous earth. I sprayed neem on the tomatoes soon after I discovered the psyllids. The next day I looked at some psyllid nymphs with a magnifying loupe and they appeared to be alive and happy. So I squirted them with some dry diatomaceous earth powder. They were still alive after a few hours, but the next day some were dead.
I'll have to check out the garden store for the other insecticides mentioned. I'm not keen on using insecticides, but I realize some are more benign than others. And those psyllids are bugging me.
Haven't tried soapy water yet, but it would be good to see what it does.
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