Monoterpenes-induced toxicity in nymphal stages of Halyomorpha halys

In this work, the toxic activity by fumigation of 10 monoterpenes was evaluated on Halyomorpha halys 2nd instar nymphs. The results showed that (±)-limonene was the monoterpene with the highest insecticidal activity (LC50 0.48 µl l−1 air), followed by two phenolic monoterpenes eugenol and isoeugenol (LC50 0.41 and 0.55 µl l−1 air, respectively). In addition, the alcoholic monoterpenes α-terpineol and l -(−)-menthol and the ketonic monoterpene (+)-pulegone exhibited strong efficacy on H. halys 2nd instar nymphs (LC50 values 0.84, 1.15 and 0.48 µl l−1 air, respectively). These preliminary data indicate that essential oils and the individual terpenic components could be used as fumigants for the control of H. halys nymphs.