Abstract
Russian wheat aphid, Diuraphis noxia, and parasitoid abundance was monitored on field-grown barley, Hordeum vulgare L., varying in D. noxia susceptibility, to address the applicability of previous laboratory assessments of barley seedling resistance and parasitoid compatibility. Study sites were representative of the barley production region of the High Plains in the western USA, where D. noxia and its parasitoids occur. D. noxia abundance on resistant barley lines, characterized as partially tolerant and antibiotic to the aphid, was lower than on more susceptible lines. Parasitism by Diaeretiella rapae, Aphelinus albipodus, and A. asychis differed in seasonal occurrence and abundance. D. rapae mummies occurred sooner than aphelinid mummies, and there were larger increases in aphelinid mummies than in D. rapae mummies during seed head development. But in regard to plant resistance, parasitoid abundance, relative to D. noxia abundance, was similar on resistant and susceptible barley lines. Based on the susceptibility of commercial barley to D. noxia, the seasonal abundance of D. noxia and its parasitoids, and the compatibility of resistant barley and D. noxia parasitoids, the use of resistant barley in areas of parasitoid establishment is justified.
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Brewer, M.J., Mornhinweg, D.W. & Huzurbazar, S. Compatibility of insect management strategies: Diuraphis noxia abundance on susceptible and resistant barley in the presence of parasitoids. BioControl 43, 479–491 (1999). https://doi.org/10.1023/A:1009929301953
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DOI: https://doi.org/10.1023/A:1009929301953