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Parasitoids such as  Ganaspis brasiliensis  and  Pachycrepoideus vindemiae  are being researched for biological control of  Drosophila suzukii , an important agricultural pest. Parasitoids can be monitored in the field by collecting infested fruit samples or using sentinel traps seeded with host larvae/pupae. Sentinel traps may be covered with a selective barrier to allow parasitoid movement, and prevent nontarget infestation and developing  D. suzukii  from exiting. In this study, two types of fabric mesh (‘square’ 1.1 × 1.1 mm 2  and ‘oval’ 1.2 × 0.8 mm 2 ) were assessed for restricting passage of  D. suzukii , and enabling passage and parasitism by  G. brasiliensis  and  P. vindemiae . Square wire meshes (1.04, 1.08, 1.11, 1.13, 1.18, and 1.53 mm 2 ) were also tested as a durable alternative to the fabric mesh for  G. brasiliensis  sentinels. Both fabric meshes and the 1.08 and 1.13 mm 2  square wire mesh prevented passage of  D. suzukii . Passage was similar through fabric mesh for both parasitoids. For  G. brasiliensis , parasitism was higher in open control sentinels than square mesh covered sentinels in one trial, but parasitism was similar at ∼40% in open and square mesh sentinels in another trial. The 1.04, 1.08 and 1.13 mm 2  square wire mesh lowered  G. brasiliensis  parasitism. For  P. vindemiae , parasitism was 2-fold higher in oval mesh than open sentinels which may be due to the mesh encouraging this wasp to forage longer. If a selective mesh must be used, the square fabric mesh prevented  D. suzukii  passage and resulted in the highest  G. brasiliensis  parasitism compared to wire meshes.

biocontrol science and technology

Mesh covers on sentinel parasitoid traps prevent  Drosophila suzukii  movement and impact parasitism by  Ganaspis brasiliensis  and  Pachycrepoideus vindemiae