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<p>Humic substances (HS) are well-known as plant biostimulants or biofertilizers, capable of enhancing plant growth and increasing tolerance to abiotic factors. However, studies investigating the effects of HS on plant resistance to insect pests remain limited and focused on only a few crops. This study investigated the impact of a HS amendment on the growth of arabica coffee seedlings and their resistance to the coffee leaf miner, <i>Leucoptera coffeella</i> (Guérin-Méneville) (Lepidoptera: Lyonetiidae). Coffee seedlings received a single application of a commercial HS-based formulation at an early growth stage. Six-month-old, undamaged HS-treated coffee plants exhibited heavier and longer roots and shoots compared to non-treated plants (control). To assess plant resistance, dual-choice and no-choice experiments were performed with HS-treated and non-treated plants. <i>L. coffeella</i> moths laid a similar number of eggs on both HS-treated and control plants in cage assays. However, poor insect development was observed on the HS-treated plant. The development period from egg to adult stage of <i>L. coffeella</i> was 20% shorter in HS-treated seedlings compared to control plants. Additionally, the leaf mine size resulting from <i>L. coffeella</i> larval feeding was, on average, 56% smaller in HS-treated seedlings. Although HS did not influence host choice by the coffee leaf miner, it impaired the performance of <i>L. coffeella</i> and reduced leaf injury. In addition to promoting early plant growth, HS enhanced plant resistance to <i>L. coffeella</i>, highlighting the potential of HS amendment in producing high-quality coffee seedlings in nurseries.</p>

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Humic substance-based formulation in coffee seedlings: enhanced plant growth and resistance to coffee leaf miner

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Livia Aparecida de Souza,
  • Fernanda Moreira Andrade,
  • Evanise Silva Penido,
  • Maria Fernanda Gomes Villalba Peñaflor

摘要

Humic substances (HS) are well-known as plant biostimulants or biofertilizers, capable of enhancing plant growth and increasing tolerance to abiotic factors. However, studies investigating the effects of HS on plant resistance to insect pests remain limited and focused on only a few crops. This study investigated the impact of a HS amendment on the growth of arabica coffee seedlings and their resistance to the coffee leaf miner, Leucoptera coffeella (Guérin-Méneville) (Lepidoptera: Lyonetiidae). Coffee seedlings received a single application of a commercial HS-based formulation at an early growth stage. Six-month-old, undamaged HS-treated coffee plants exhibited heavier and longer roots and shoots compared to non-treated plants (control). To assess plant resistance, dual-choice and no-choice experiments were performed with HS-treated and non-treated plants. L. coffeella moths laid a similar number of eggs on both HS-treated and control plants in cage assays. However, poor insect development was observed on the HS-treated plant. The development period from egg to adult stage of L. coffeella was 20% shorter in HS-treated seedlings compared to control plants. Additionally, the leaf mine size resulting from L. coffeella larval feeding was, on average, 56% smaller in HS-treated seedlings. Although HS did not influence host choice by the coffee leaf miner, it impaired the performance of L. coffeella and reduced leaf injury. In addition to promoting early plant growth, HS enhanced plant resistance to L. coffeella, highlighting the potential of HS amendment in producing high-quality coffee seedlings in nurseries.