These guidelines from Univ California are for commercial growers, but they do give some insights.

http://www.ipm.ucdavis.edu/PMG/r783303011.html

Note that they specifically advise against Sevin.

Perhaps direct hits of insecticidal soap might work.

Beyond that, a google-dot-com search for tomato pysllid brings up a number of hits you can check on.
http://www.google.com/search?hl=en&q=tomato+psyllid

Here is a link that might be useful: a search for tomato psyllid info