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This study aimed to evaluate the chemotactic responses of Trichogramma pretiosum (Riley) (Hymenoptera: Trichogrammatidae) females and parasitism rates in the presence of components associated with a Brassica oleracea var. acephala (L.) cropping system: the flowering plant Lobularia maritima (L.) (sweet alyssum), the essential oil of Corymbia citriodora Hook (EOCC) (Myrtales: Myrtaceae), eggs of Plutella xylostella (L.) (Lepidoptera: Plutellidae), and the parasitoid T. pretiosum, tested either individually or in combination. In a double-choice olfactometer, sweet alyssum was attractive to T. pretiosum females, while cabbage exhibited a repellent effect. Host eggs and EOCC, when tested individually, did not attract the parasitoid. The combination of cabbage\u2009+\u2009eggs increased attractiveness, which was further enhanced by adding EOCC. Laboratory parasitism bioassays showed no differences among the treatments with cabbage, cabbage\u2009+\u2009EOCC, and cabbage\u2009+\u2009sweet alyssum, whereas the cabbage\u2009+\u2009sweet alyssum\u2009+\u2009EOCC treatment differed significantly. Under semi-field conditions, cabbage alone resulted in lower parasitism compared with the other treatments. Emergence rates were generally high (83% to 90%), except for cabbage\u2009+\u2009sweet alyssum\u2009+\u2009EOCC, which showed reduced emergence. Overall, sweet alyssum is highlighted as a valuable companion plant for attracting T. pretiosum, and EOCC showed potential to support the management of P. xylostella, although certain combinations may negatively affect parasitoid performance.<\/jats:p>","DOI":"10.1093\/ee\/nvag100","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T19:12:38Z","timestamp":1789672358000},"source":"Crossref","is-referenced-by-count":0,"title":["Chemotactic responses and parasitism of\n                    <i>Trichogramma pretiosum<\/i>\n                    (Hymenoptera: Trichogrammatidae) influenced by sweet alyssum, essential oil of lemon eucalyptus, and host-plant components"],"prefix":"10.1093","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-6672-2262","authenticated-orcid":false,"given":"Sheila","family":"Puntel","sequence":"first","affiliation":[{"name":"Federal University of Rio Grande do Sul, Faculty of Agronomy, Plant Science Department , Porto Alegre, Rio Grande do Sul,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simone Mundstock","family":"Jahnke","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul, Faculty of Agronomy, Plant Science Department , Porto Alegre, Rio Grande do Sul,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luiza Rodrigues","family":"Redaelli","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul, Faculty of Agronomy, Plant Science Department , Porto Alegre, Rio Grande do Sul,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Josu\u00e9","family":"Sant\u2019Ana","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul, Faculty of Agronomy, Plant Science Department , Porto Alegre, Rio Grande do Sul,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduarda","family":"Bender","sequence":"additional","affiliation":[{"name":"Federal University of Rio Grande do Sul, Faculty of Agronomy, Plant Science Department , Porto Alegre, Rio Grande do Sul,","place":["Brazil"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-5995-9138","authenticated-orcid":false,"given":"Adriana Acevedo","family":"Alcal\u00e1","sequence":"additional","affiliation":[{"name":"Colegio de Postgraduados, Posgrado en Fitosanidad, Texcoco, Estado de Mexico, M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"2026092423150419500_nvag100-B1","doi-asserted-by":"publisher","DOI":"10.3389\/fevo.2021.703134","article-title":"Attraction of Trichogramma wasps to butterfly oviposition-induced plant volatiles depends on Brassica species, wasp strain and leaf necrosis","volume":"9","author":"Afentoulis","year":"2021","journal-title":"Front. 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