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Monoterpenes-induced toxicity in nymphal stages of Halyomorpha halys

Abstract:

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.