Outcome of Fungi, predatory mites and guardian plants for thrips IPM in organic greenhouse ornamentals


Thrips are a virus-transmitting pest that wreak havoc in greenhouses, causing problems for both organic and conventional growers. The treatment that combined a granular fungal treatment and predatory mites with marigold "guardian plants" appeared to suppress thrips more effectively than marigolds with predatory mites alone.

Photo of thrips on marigold blossom






This project was done in a commercial greenhouse where natural build-up of thrips was expected; however thrip levels stayed low to medium throughout the experiment, not allowing the system to be tested under high levels of pressure.