Dennis,
Try using 'Thrip Stick' . It's a non-chemical control similar to using
fly-paper. Thrip Stick is basically a piece of bright yellow plastic that
has a coating of polybutene, a highly sticky substance. Thrips are attracted
to the colour of the plastic and stick to it and die. I used to cut up the
plastic cards into 2-3 inch squares and place these on pea sticks in pots so
that they are at the same height as the flowers. The benefit of using 'Thrip
Stick' is that it will also catch other flies, like fungus gnat and wasps;
however it will also catch any biological control as well. They last for
months but if they are successful in catching flies, can look a bit
unsightly after a while.

Found a good thrip link for you
http://www.biocontrol.ucr.edu/WFT.html (Western Flower Thrip)

Best Wishes,
Dave
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