ArticlePest management science2026
Optimized host adaptation to Eri silkworm eggs enhances fitness and biological control efficacy of Trichogramma ostriniae against the Asian corn borer.
Article in Pest management science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundTo develop a cost-effective mass-rearing strategy for Trichogramma ostriniae, a key parasitoid of the Asian corn borer (ACB, Ostrinia furnacalis), we evaluated the suitability of Eri silkworm (ES, Samia ricini) eggs as an alternative host to the commonly used rice moth (RM, Corcyra cephalonica) eggs. Three geographical populations of T. ostriniae [Guizhou (GZ-To), Shandong (SD-To) and Jilin (JL-To)] were assessed on ES eggs under different rearing conditions, including parasitoid-to-host ratios (3:1, 5:1, 7:1), parasitization duration (24, 48, 72, 96 h), and female wasp age (0, 1, 2, 3, 4 and 5 days old). In addition, we assessed the parasitic potential of T. ostriniae reared on ES (ES-To) and RM (RM-To) to different aged ACB eggs (0, 1 and 2 days old).
resultsAll populations were able to parasitize ES eggs, although the GZ-To population did not show successful emergence. SD-To exhibited optimal parasitism performance at a wasp-to-host ratio of 5:1, but its performance remained significantly inferior to that of JL-To. JL-To showed superior performance, particularly at a parasitoid-to-host ratio of 3:1 and a parasitization duration of 48 h. Female wasp age significantly affected rearing performance, with 3-day-old females exhibiting the highest parasitism rate, emergence rate and offspring production per host egg. Furthermore, ES-To produced larger adults and demonstrated significantly higher parasitism efficiency against ACB eggs than those of RM-To, achieving parasitism rates exceeding 80%.
conclusionThe optimal rearing conditions were identified as JL-To females aged 3 days, a parasitoid-to-host ratio of 3:1, and a parasitization duration of 48 h. These findings demonstrate the potential of ES eggs as an effective alternative host for rearing T. ostriniae, offering a practical approach to improve parasitoid quality and enhance biocontrol programs against the ACB. © 2026 Society of Chemical Industry.
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