Thrips fought quite vigorously when seen as pests on plants, but once they are flying and are numerous, there is nothing to do outdoors. The thrips which make it inside, die very quickly – the climate inside is too dry for them. If you are not willing to wait for them to die naturally, they can be eradicated with an insect spray with pyrethrin I and II + piperonyl butoxide. It’s hard to effectively keep thrips out. They fly through fly screens; however, if doors and windows are kept closed on flying days, and spray before-mentioned pyrethrin in the cracks, it is possible to tone down the discomfort.
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