Secondary plant compounds, such as essential oils, have the ability to interfere with the host plant selection process by insect pests.
In the first part of this report we describe the results of laboratory and greenhouse experiments in which a number of these compounds have been tested against the western flower thrips (Frankliniella occidentalis).
In the second part of this report attention is paid to the extrinsic and intrinsic factors that may affect the activity of the commercially available attractant Lurem-TR towards western flower thrips.
From the laboratory and greenhouse experiments no plant compounds have been identified that have a clear repellent activity against western flower thrips. Remarkably, there was large variation between repetitions within the experiments. From the attractant Lurem-TR it was already known in practice (both nationally, and internationally) that the effect could vary substantially. From the research described in this report it shows that both extrinsic (temperature, wind speed) and intrinsic (geographical origin of the thrips population) factors can strongly affect the activity of Lurem-TR. For future research on the repellent or attractive activity of plant compounds on pest organisms it is therefore very important that attention is paid to the possible influence of extrinsic and intrinsic factors.
Sponsor of the research: Productschap Tuinbouw