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Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: A less time-consuming field method

Rivano Franck, Martinez Malena, Cevallos Victor, Cilas Christian. 2010. Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: A less time-consuming field method. European Journal of Plant Pathology, 126 (4) : pp. 541-552.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : HORTICULTURE / Quartile : Q2, Sujet : AGRONOMY / Quartile : Q2, Sujet : PLANT SCIENCES

Abstract : Resistance of rubber tree clones to South American Leaf Blight (SALB) caused by the fungus Microcyclus ulei is normally assessed in specific large-scale clone trials, which in general entail a considerable amount of work. Four variables are observed monthly on each tree over many years: disease severity and conidial sporulation intensity on young leaves, and severity and stroma density on mature leaves. In order to simplify this field assessment method, we tested the resistance of eight rubber tree clones to M. ulei in Ecuador in a Fisher block design with four replicates per treatment. Three months after planting, monthly observations were made for a period of 12 months on the foliage focusing on the four variables, in order to quantify disease development. Given the correlations between the four variables, assessment of conidial sporulation intensity on young leaves and stroma density on mature leaves should be sufficient. The most suitable period to start the assessment was 6 months after planting, for a duration of six to nine months. As repeated observations on the same trees were autocorrelated, it was possible to reduce the assessment frequency to once every 2 months. To conclude, assessing the resistance of rubber tree clones to SALB in large-scale clone trials can be optimized to reduce the number of observation times by 50%. (Résumé d'auteur)

Mots-clés Agrovoc : Microcyclus ulei, Hevea brasiliensis, Sporulation, Résistance aux maladies, Expérimentation au champ, clone, Modèle mathématique, Évaluation

Mots-clés géographiques Agrovoc : Équateur

Classification Agris : H20 - Plant diseases
U10 - Computer science, mathematics and statistics

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Rivano Franck, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA)
  • Martinez Malena, INIAP (ECU)
  • Cevallos Victor, INIAP (ECU)
  • Cilas Christian, CIRAD-BIOS-UPR Bioagresseurs de pérennes (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/553751/)

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