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• W3204248536 abstract "Abstract Plant defense elicitors (PDEs) are chemicals that stimulate plant defenses against pathogens and herbivores. Previous work shows that PDEs acibenzolar‐S‐methyl (ASM) and harpinαβ protein (harpin) can induce the pathogenesis‐related gene PR‐1 in plants and suppress herbivorous arthropods. In this study, we tested the potential for these PDEs to induce PR‐1 in pear, Pyrus communis L. (Rosaceae) orchards and suppress pear psylla, Cacopsylla pyricola (Förster) (Hemiptera: Psyllidae), and spider mites, Tetranychus spp. (Acari: Tetranychidae). In 2017, we compared densities of each pest on mature pear trees following a single application of either an ASM product (Actigard; Syngenta), a harpin product (Employ; Plant Health Care), or no PDE treatment in four commercial and two research center orchards. In 2018, we sampled pear psylla and used qPCR to assess PR‐1 induction in pear leaf samples before and after PDE treatments at one commercial orchard. Neither PDE treatment showed evidence of pest suppression in either year, and no differences in PR‐1 expression were detected. Potted greenhouse trees treated with ASM in 2019 showed higher PR‐1 expression relative to untreated trees, verifying that our procedures can detect induction and suggesting that a single PDE application was sufficient to induce PR‐1 in potted but not mature pear trees. We conclude that plant defense elicitors may contribute to pear pest suppression in some contexts, but effects are unlikely to be strong or consistent. Our results highlight the need for field experiments to advance plant defense elicitor knowledge towards effective field applications." @default.
• W3204248536 created "2021-10-11" @default.
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• W3204248536 date "2021-10-09" @default.
• W3204248536 modified "2023-09-24" @default.
• W3204248536 title "Test of plant defense elicitors for arthropod pest suppression and PR‐1 gene induction in pear orchards" @default.
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• W3204248536 doi "https://doi.org/10.1111/eea.13110" @default.
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