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We investigated the recruitment of specific parasitoids using a specific blend of synthetic herbivory-induced plant volatiles (HIPVs) as a novel method of pest control in greenhouses. In the Miyama rural area in Kyoto, Japan, diamondback moth (DBM) ( Plutella xylostella , Lepidoptera: Plutellidae) larvae are an important pest of cruciferous crops in greenhouses, and  Cotesia vestalis  (Hymenoptera: Braconidae), a larval parasitoid of DBM, is found in the surrounding areas. Dispensers of HIPVs that attracted  C. vestalis  and honey feeders were set inside greenhouses (treated greenhouses). The monthly incidence of DBMs in the treated greenhouses was significantly lower than that in the untreated greenhouses over a 2-year period. The monthly incidences of  C. vestalis  and DBMs were not significantly different in the untreated greenhouses, whereas monthly  C. vestalis  incidence was significantly higher than monthly DBM incidence in the treated greenhouses. Poisson regression analyses showed that, in both years, a significantly higher number of  C. vestalis  was recorded in the treated greenhouses than in the untreated greenhouses when the number of DBM adults increased. We concluded that DBMs were suppressed more effectively by  C. vestalis  in the treated greenhouses than in the untreated greenhouses.

Targeting diamondback moths in greenhouses by attracting specific native parasitoids with herbivory-induced plant volatiles