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<p>Berseem clover (<i>Trifolium alexandrinum</i> L.) is an important forage crop for livestock farming in Algeria. This crop is susceptible to many fungal diseases that can affect yield and forage quality. Surveys carried out in several regions of Algeria, enabled us to collect a large number of diseased samples from berseem crops showing symptoms of leaf spot and stem/root necrotic diseases, commonly known as Ascochyta Blight (anthracnosis). Among the fungal species isolated and identified, three species <i>Ascochyta nigripycnidia</i>, <i>Didymella pinodella</i>, and <i>Boeremia exigua</i> were considered in this study. To assess the pathogenicity and the host range of these three species, eight isolates (3 <i>A. nigripycnidia</i>, 3 <i>D. pinodella</i>, and 2 <i>B. exigua</i>) were selected and inoculated on the above and below-ground parts of berseem, alfalfa, vetch, pea, chickpea, and faba bean. Disease incidence and severity disease were assessed on leaves, epicotyls and roots of the inoculated plants. All these fungal species had caused serious symptoms on the organs of the Fabaceae studied, with varying levels of attacks according to the species and the isolates tested. <i>A. nigripycnidia</i> caused severe attacks on berseem and chickpea, but showed little severity on alfalfa, vetch, and pea. This is the first evidence that <i>A. nigripycnidia</i> is not specific to vetch, but can attack other Fabaceae. <i>D. pinodella</i> showed no specialization, and attacked indifferently all inoculated organs of the tested species. In the end <i>B. exigua</i> was the least aggressive pathogen on the legumes tested, and was more pathogenic on berseem leaves and roots.</p>

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Pathogenicity of Ascochyta nigripycnidia, Didymella pinodella and Boeremia exigua isolated from Trifolium alexandrinum in Algeria and assessment of their host range on some Fabaceae

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Naouel Ghiat,
  • Hayet Meamiche-Neddaf,
  • Alessandro Infantino,
  • Christophe Le May,
  • Abdelaziz Keddad,
  • Abdelmoumen Taoutaou,
  • Manu Affichard,
  • Zouaoui Bouznad

摘要

Berseem clover (Trifolium alexandrinum L.) is an important forage crop for livestock farming in Algeria. This crop is susceptible to many fungal diseases that can affect yield and forage quality. Surveys carried out in several regions of Algeria, enabled us to collect a large number of diseased samples from berseem crops showing symptoms of leaf spot and stem/root necrotic diseases, commonly known as Ascochyta Blight (anthracnosis). Among the fungal species isolated and identified, three species Ascochyta nigripycnidia, Didymella pinodella, and Boeremia exigua were considered in this study. To assess the pathogenicity and the host range of these three species, eight isolates (3 A. nigripycnidia, 3 D. pinodella, and 2 B. exigua) were selected and inoculated on the above and below-ground parts of berseem, alfalfa, vetch, pea, chickpea, and faba bean. Disease incidence and severity disease were assessed on leaves, epicotyls and roots of the inoculated plants. All these fungal species had caused serious symptoms on the organs of the Fabaceae studied, with varying levels of attacks according to the species and the isolates tested. A. nigripycnidia caused severe attacks on berseem and chickpea, but showed little severity on alfalfa, vetch, and pea. This is the first evidence that A. nigripycnidia is not specific to vetch, but can attack other Fabaceae. D. pinodella showed no specialization, and attacked indifferently all inoculated organs of the tested species. In the end B. exigua was the least aggressive pathogen on the legumes tested, and was more pathogenic on berseem leaves and roots.