Olive fruit fly remains the most damaging pest, with significant yearly damages on fruits and olive oil quality. Although several parasitoids are known, biocontrol levels are usually low, below 4%. Landscape has been intensively simplified in the last decades, leading to biodiversity erosion, and loss of trophic relations. Literature however shows interactions between olive tree and other mediterranean species, hosting beneficial insects on alternative phytophagous species.
By sawing or planting Dittrichia viscosa, we intend to increase the population of phytophagous diptera (Myopites stylata), and in a second time of the larval parasitoid Eupelmus urozonus.
A questionnaire will be submitted to growers using D. viscosa, in order to better estimate how the plant is developing, and if Myopites galls can be observed.
Lactuca viminea is also suspected as an interesting host plant, and will be set up in some orchards if seeds can be easily found.
In a second time, augmentoria (emergence cages) will be set up in orchards, allowing micro-hymenoptera to emerge, but keeping olive flies inside.