Shade effects on the dispersal of airborne Hemileia vastatrix uredospores

Boudrot Audrey, Pico Jimmy, Merle Isabelle, Granados Eduardo, Vilchez Sergio, Tixier Philippe, Virginio Filho Elias de Melo, Casanoves Fernando, Tapia Ana, Allinne Clémentine, Rice Robert A., Avelino Jacques. 2016. Shade effects on the dispersal of airborne Hemileia vastatrix uredospores. Phytopathology, 106 : 572-580.

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Hemileia vastatrix caused a severe epidemic in Central America in 2012 _ 13. The gradual development of that epidemic on nearly a continental scale suggests that dispersal at different scales played a significant role. Shade has been proposed as a way of reducing uredospore dispersal. The effect of shade (two strata: Erythrina poeppigiana below and Chloroleucon eurycyclum above) and full sun on H. vastatrix dispersal was studied with Burkard traps in relation to meteorological records. Annual and daily patterns of dispersal were observed, with peaks of uredospore capture obtained during wet seasons and in the early afternoon. A maximum of 464 uredospores in 1 day (in 14.4 m 3 of air) was recorded in October 2014. Interactions between shade/full sun and meteorological conditions were found. Rainfall, possibly intercepted by tree cover and redistributed by raindrops of higher kinetic energy, was the main driver of uredospore dis- persal under shade. Wind gusts reversed this effect, probably by inhibiting water accumulation on leaves. Wind gusts also promoted dispersal under dry conditions in full sun, whereas they had no effect under shaded conditions, probably because the canopy blocked the wind. Our results indicate the importance of managing shade cover differentially in rainy versus dry periods to control the dispersal of airborne H. vastatrix Uredospores.

Mots-clés Agrovoc : Coffea arabica, agroforesterie, Hemileia vastatrix, ombrage, rouille, facteur du milieu, lutte biologique, pratique culturale

Mots-clés géographiques Agrovoc : Costa Rica

Mots-clés libres : Coffea arabica, Costa Rica, Agroforestry, Coffee rust

Classification Agris : H20 - Maladies des plantes
F08 - Systèmes et modes de culture

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Boudrot Audrey, INIAP (ECU)
• Pico Jimmy, ENSAIA (FRA)
• Merle Isabelle, CIRAD-BIOS-UPR Bioagresseurs (FRA)
• Granados Eduardo, UCR (CRI)
• Vilchez Sergio, CATIE (CRI)
• Tixier Philippe, CIRAD-PERSYST-UPR Systèmes de culture bananes et ananas (CRI) ORCID: 0000-0001-5147-9777
• Virginio Filho Elias de Melo, CATIE (CRI)
• Casanoves Fernando, CATIE (CRI)
• Tapia Ana, UCR (CRI)
• Allinne Clémentine, CIRAD-PERSYST-UMR SYSTEM (CRI) ORCID: 0000-0002-8147-5977
• Rice Robert A., Smithsonian Conservation Biology Institute (USA)
• Avelino Jacques, CIRAD-BIOS-UPR Bioagresseurs (CRI) ORCID: 0000-0003-1983-9431

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580457/)

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