David Fenwick Snr.
Sat, 11 Dec 2010 10:01:04 PST
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 (Western Flower Thrip)

Best Wishes,

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