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Miscanthus  x  giganteus  ( Miscanthus ) grass shelterbelts can deliver multiple ecosystem services on New Zealand commercial dairy farms. However, there has been little investigation into how these shelterbelts contribute to insect pest management. Here, on a Canterbury dairy farm, we investigated what generalist surface-dwelling invertebrate natural enemies of insect pests inhabit three separate  Miscanthus  shelterbelts compared to three unmanipulated field margin plots. The potential contribution of these natural enemy assemblages to future biological control was also investigated. To measure this, live moth egg baits with associated pitfall trapping were deployed in autumn, winter and spring of 2015.  Miscanthus  and the field margin plots were found to have similar potential natural enemy richness but differed in their community composition. The potential predation rate of pests in  Miscanthus  was 85% higher than in the field margin. Infrared video and Sanger sequencing confirmed that the harvestman  Phalangium opilio  and the slug  Deroceras reticulatum  consumed the egg baits in  Miscanthus . Conversely, no bait-consuming invertebrates were identified in the field margin. These preliminary results indicate potential natural enemies inhabit  Miscanthus  and may consume insect pest eggs on the soil-surface. However, to achieve anyinsect pest suppression, further habitat manipulation would be required.

Assessing the potential of invertebrate natural enemies of insect pests inhabiting Miscanthus x giganteus shelterbelts in pasture