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<p>The gall wasp <i>Leptocybe invasa</i> Fisher &amp; La Salle (Hymenoptera: Eulophidae) is a major limiting factor in the cultivation of eucalyptus both in Brazil and across the world. This insect induces a gall formation on the principal veins of leaves, apices and petioles. This study investigated the impact of inoculating the fungus <i>T. harzianum</i> on plant growth and defense responses of <i>Eucalyptus</i> to <i>Leptocybe invasa</i>. Two hybrid eucalypt clones (<i>Eucalyptus tereticornis</i> Sm. × <i>Eucalyptus camaldulensis</i> Dehnh.) were used to produce seedlings. Plants were inoculated by spraying the T<i>. harzianum</i> conidial suspension onto the fourth, fifth and sixth fully expanded leaves. Evaluations of ovipositions and galls were carried out 7 and 44&#xa0;days after infestation (d.a.i), and growth parameters were assessed at six points during the experiment: 15, 30, 45, 60, 75 and 90 d.a.i. Our findings show that susceptible and resistant non-inoculated <i>Eucalyptus</i> plants infested by <i>L. invasa</i> developed galls. However, only oviposition marks were observed in inoculated plants without gall formation, indicating that <i>T. harzianum</i> inoculation enhances <i>Eucalyptus</i> resistance to <i>L. invasa</i>. Additionally, inoculated plants showed increased height, leaf count and branch growth. The findings of this study suggest that <i>T. harzianum</i> has significant potential for controlling <i>L. invasa</i> infestations in susceptible <i>Eucalyptus</i> plantations and the added advantage of enhanced plant growth.</p>

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Morphological responses of Eucalyptus demonstrate the potential of Trichoderma harzianum to promote resistance against Leptocybe invasa

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Louis Antoniel Joseph,
  • Nívea Maria Pereira Lima,
  • Pedro Augusto Laurindo Rocha,
  • Aloísio Freitas Chagas Júnior,
  • João Pedro Laurindo Rocha,
  • Jéssica Soares Pereira,
  • Auxiliadora Oliveira Martins,
  • Cristiano Bueno de Moraes,
  • Márcio Leles Romarco de Oliveira,
  • Wagner Luiz Araújo,
  • Maíra Ignacio Sarmento,
  • Renato Almeida Sarmento

摘要

The gall wasp Leptocybe invasa Fisher & La Salle (Hymenoptera: Eulophidae) is a major limiting factor in the cultivation of eucalyptus both in Brazil and across the world. This insect induces a gall formation on the principal veins of leaves, apices and petioles. This study investigated the impact of inoculating the fungus T. harzianum on plant growth and defense responses of Eucalyptus to Leptocybe invasa. Two hybrid eucalypt clones (Eucalyptus tereticornis Sm. × Eucalyptus camaldulensis Dehnh.) were used to produce seedlings. Plants were inoculated by spraying the T. harzianum conidial suspension onto the fourth, fifth and sixth fully expanded leaves. Evaluations of ovipositions and galls were carried out 7 and 44 days after infestation (d.a.i), and growth parameters were assessed at six points during the experiment: 15, 30, 45, 60, 75 and 90 d.a.i. Our findings show that susceptible and resistant non-inoculated Eucalyptus plants infested by L. invasa developed galls. However, only oviposition marks were observed in inoculated plants without gall formation, indicating that T. harzianum inoculation enhances Eucalyptus resistance to L. invasa. Additionally, inoculated plants showed increased height, leaf count and branch growth. The findings of this study suggest that T. harzianum has significant potential for controlling L. invasa infestations in susceptible Eucalyptus plantations and the added advantage of enhanced plant growth.