Abstract/Summary

Air pollutants, such as nitrogen oxides, emitted in diesel exhaust, and ozone, disrupt interactions between plants, the insect herbivore pests that feed upon them, and natural enemies of those herbivores (e.g., parasitoids). Using eight field-based rings that emit regulated quantities of diesel exhaust and ozone, we investigated how both pollutants, individually and in combination, altered the attraction and parasitism rate of a specialist parasitoid (Diaeretiella rapae) on aphid-infested and un-infested Brassica napus plants. Individual effects of ozone decreased D. rapae abundance and emergence by 37% and 55%, respectively, compared with ambient (control) conditions. When ozone and diesel exhaust were emitted concomitantly, D. rapae abundance and emergence increased by 79% and 181%, respectively, relative to control conditions. This attraction response occurred regardless of whether plants were infested with aphids and was associated with an increase in concentration of aliphatic glucosinolates, especially gluconapin (3-butenyl glucosinolate), within B. napus leaves. Plant defensive responses and their ability to attract natural aphid enemies may be beneficially impacted by pollution exposure. These results demonstrate the importance of incorporating multiple air pollutants when considering the effects of air pollution on plant-insect interactions.