If you battle thrips and want some help with a plan of action here is a great resource for that information. The following publication is a reference tool to help you develop a course of action in the management of thrips. This publication provides a decision key that asks different questions to help you develop the appropriate strategy. It even gives information on biological control as well as more natural type chemicals such as soaps and oils. What I found useful was the approximate duration of control and what life stage a particular pesticide would be useful.
If you would like to investigate further, please click on the link for further information.