I have not made a comment or contribution in quite a while. No, I have not abandoned OT, just preoccupied with other activities. I do however, drop by to see what is going on here.
I have been following this thread since I too have from time to time had to deal with Thrip infestations particularly in the hot and dry months.
The last Post by SusanLee spoke about seeing the insects flying around. My experience dealing with Thrips is that they are so very very tiny that it is difficult to see them unless you take a damaged flower apart and take it into bright light in order to see them. Evidence of thrips is more easily identified by the damage they do to your flowers and hanging roots than by seeing them.
I would like others to comment on this, or tell me I am wrong.