Selectivity and effects of essential oils on the egg parasitoid Telenomus remus (Nixon, 1937) (Hymenoptera: Scelionidae) reared on Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) and Corcyra cephalonica (Stainton, 1866) (Lepidoptera: Pyralidae)
DOI:
https://doi.org/10.37486/1809-8460.ba21005Keywords:
Fall armyworm, Rice moth, Biological control, Botanical extracts, Integrated Pest ManagementAbstract
Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) is a polyphagous and cosmopolitan pest that damages economically important crops. Efficient management requires integrated strategies, with emphasis on biological control. Telenomus remus (Nixon, 1937) (Hymenoptera: Scelionidae) is an egg parasitoid of Spodoptera spp., but it can also develop in other lepidopterans, such as Corcyra cephalonica (Stainton, 1866) (Lepidoptera: Pyralidae), making it a promising alternative host. The effectiveness of biological control depends on its compatibility with other tactics, such as essential oils (EOs) with insecticidal properties. This study evaluated the selectivity and effects of Syzygium aromaticum (L.) Merr. & L.M.Perry, Cymbopogon citratus DC. Stapf., Schinus terebinthifolius Raddi, Cordia verbenacea DC., Baccharis dracunculifolia DC., and Callistemon viminalis (Sol. ex Gaertn.) G. Don. EOs on T. remus reared on S. frugiperda and C. cephalonica. The longevity and parasitism of the parental and F1 generations, and the emergence rate and sex ratio of F1 and F2 generations, were assessed. Toxicity was classified according to IOBC standards. Baccharis dracunculifolia, C. citratus, and S. aromaticum showed selectivity for F1 parasitism, but not for the parental generation. Except for B. dracunculifolia, all oils were selective for F1 emergence in S. frugiperda. The longevity of parasitoids reared on C. cephalonica was lower than that observed in S. frugiperda. In the adult stage, S. terebinthifolius, C. verbenacea, C. viminalis, and C. citratus exhibited selectivity for T. remus reared on S. frugiperda, whereas in C. cephalonica, only C. viminalis was selective. No effects were observed on F2 parameters. The results indicate the potential for integrating the use of EOs with T. remus in the management of S. frugiperda.
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Fundação de Amparo à Pesquisa do Estado de São Paulo
Grant numbers 2021/10157-0