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This raises the issue of whether deliberate endosymbiont introductions could be used to decrease crop damage caused by insect pests. Here, we investigate how transinfecting\n                    <jats:italic>Rickettsiella viridis<\/jats:italic>\n                    and\n                    <jats:italic>Regiella insecticola<\/jats:italic>\n                    endosymbionts into a novel pest aphid host, the Russian wheat aphid (\n                    <jats:italic>Diuraphis noxia<\/jats:italic>\n                    ), influences population growth, alate production, dispersal ability, and crop damage. Both the\n                    <jats:italic>Rickettsiella<\/jats:italic>\n                    (originating from pea aphids) and\n                    <jats:italic>Regiella<\/jats:italic>\n                    (from green peach aphids) were stably maintained in their new host where they had contrasting effects.\n                    <jats:italic>Rickettsiella<\/jats:italic>\n                    increased the severity of aphid feeding damage on wheat and barley, resulting in greater leaf loss, chlorotic streaking, and higher aphid populations, whereas\n                    <jats:italic>Regiella<\/jats:italic>\n                    reduced aphid population growth and the severity of feeding damage by aphids. Their effects on dispersal morphology also differed:\n                    <jats:italic>Regiella<\/jats:italic>\n                    had no detectable impact on alate incidence, while\n                    <jats:italic>Rickettsiella<\/jats:italic>\n                    consistently suppressed wing formation in small cages, and in larger mesocosms with multiple wheat plants this endosymbiont suppressed dispersal. Endosymbiont-mediated changes in feeding damage did not involve the main plant immune response pathways: transinfected and wild type aphids induced similar levels of jasmonic acid, jasmonic acid-isoleucine, and salicylic acid in plant tissues, even though these plant defenses were strongly activated during aphid feeding. Novel endosymbionts can therefore modulate the severity of plant feeding damage by aphids as well as influencing aphid dispersal. Potential applications in controlling pest\n                    <jats:italic>D. noxia<\/jats:italic>\n                    populations are discussed.\n                  <\/jats:p>","DOI":"10.7554\/elife.111255","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T14:31:49Z","timestamp":1789482709000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.111255","source":"Crossref","is-referenced-by-count":0,"title":["Novel but stable endosymbionts have contrasting effects on aphid dispersal and plant feeding damage in the cereal pest Diuraphis noxia"],"prefix":"10.7554","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0591-0356","authenticated-orcid":true,"given":"Xinyue","family":"Gu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01ej9dk98","id-type":"ROR","asserted-by":"publisher"}],"name":"Pest and Environmental Adaptation Research Group, School of BioSciences, Bio21 Molecular Science and Biotechnology Institute, The 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