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<p>The global agricultural sector is increasingly seeking pest management strategies that reduce reliance on synthetic pesticides and minimize associated environmental and health risks. In this context, plant-derived bioactive compounds have attracted growing attention as potential components of sustainable crop protection. Among them, the genus <i>Tagetes</i> represents a&#xa0;particularly relevant model because of its chemically diverse and multitarget biological activity. This review critically synthesizes current evidence on the biocontrol potential of <i>Tagetes</i> against weeds, fungal pathogens, insect pests, and plant-parasitic nematodes, with emphasis on the phytochemical basis and mechanistic pathways underlying these effects. Available data indicate marked organ-specific variation in chemical composition, with leaves, flowers, and roots serving as important sources of bioactive metabolites. Key constituents include thiophenes, especially alpha-terthienyl (α-terthienyl), terpenes such as ocimenone and piperitone, and phenolic compounds including quercetin and gallic acid. These metabolites are associated with phytotoxic, antifungal, insecticidal or repellent, and nematicidal activities, although their efficacy is strongly influenced by chemical composition, mode of release, and environmental context. A&#xa0;central contribution of this review is the integration of belowground and aboveground modes of action, linking root-mediated suppression of nematodes with volatile-mediated protection against insect pests in agroecological systems such as push–pull strategies. We further identify major constraints to field application, including autotoxicity, residue persistence, and inconsistent performance under variable conditions, and argue that future progress will depend on standardized fractions, improved formulation technologies, and rigorous field validation. Overall, <i>Tagetes</i> offers substantial, but still underdeveloped, potential as a&#xa0;component of ecologically based integrated pest management.</p>

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Allelopathic Mechanisms in Tagetes Species: Scientific Basis and Prospects in Biological Pest Control

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Gia Huy Nguyen,
  • Lam Thuan Hung Tran,
  • Nhat Vy Vu,
  • Le Thi Ho

摘要

The global agricultural sector is increasingly seeking pest management strategies that reduce reliance on synthetic pesticides and minimize associated environmental and health risks. In this context, plant-derived bioactive compounds have attracted growing attention as potential components of sustainable crop protection. Among them, the genus Tagetes represents a particularly relevant model because of its chemically diverse and multitarget biological activity. This review critically synthesizes current evidence on the biocontrol potential of Tagetes against weeds, fungal pathogens, insect pests, and plant-parasitic nematodes, with emphasis on the phytochemical basis and mechanistic pathways underlying these effects. Available data indicate marked organ-specific variation in chemical composition, with leaves, flowers, and roots serving as important sources of bioactive metabolites. Key constituents include thiophenes, especially alpha-terthienyl (α-terthienyl), terpenes such as ocimenone and piperitone, and phenolic compounds including quercetin and gallic acid. These metabolites are associated with phytotoxic, antifungal, insecticidal or repellent, and nematicidal activities, although their efficacy is strongly influenced by chemical composition, mode of release, and environmental context. A central contribution of this review is the integration of belowground and aboveground modes of action, linking root-mediated suppression of nematodes with volatile-mediated protection against insect pests in agroecological systems such as push–pull strategies. We further identify major constraints to field application, including autotoxicity, residue persistence, and inconsistent performance under variable conditions, and argue that future progress will depend on standardized fractions, improved formulation technologies, and rigorous field validation. Overall, Tagetes offers substantial, but still underdeveloped, potential as a component of ecologically based integrated pest management.