Cassava whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) in East African farming landscapes: A review of the factors determining abundance

Macfadyen S., Paull C., Boykin L.M., De Barro Paul, Maruthi M.N., Otim M.O., Kalyebi A., Vassão D.G., Sseruwagi Peter, Tay Wee Tek, Delatte Hélène, Seguni Z., Colvin John, Omongo Christopher A.. 2018. Cassava whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) in East African farming landscapes: A review of the factors determining abundance. Bulletin of Entomological Research, 108 (5) : 565-582.

Quartile : Q2, Sujet : ENTOMOLOGY

Liste HCERES des revues (en SHS) : oui

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

Résumé : Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is a pest species complex that causes widespread damage to cassava, a staple food crop for millions of households in East Africa. Species in the complex cause direct feeding damage to cassava and are the vectors of multiple plant viruses. Whilst significant work has gone into developing virus-resistant cassava cultivars, there has been little research effort aimed at understanding the ecology of these insect vectors. Here we assess critically the knowledge base relating to factors that may lead to high population densities of sub-Saharan African (SSA) B. tabaci species in cassava production landscapes of East Africa. We focus first on empirical studies that have examined biotic or abiotic factors that may lead to high populations. We then identify knowledge gaps that need to be filled to deliver sustainable management solutions. We found that whilst many hypotheses have been put forward to explain the increases in abundance witnessed since the early 1990s, there are little published data and these tend to have been collected in a piecemeal manner. The most critical knowledge gaps identified were: (i) understanding how cassava cultivars and alternative host plants impact population dynamics and natural enemies; (ii) the impact of natural enemies in terms of reducing the frequency of outbreaks and (iii) the use and management of insecticides to delay the development of resistance. In addition, there are several fundamental methodologies that need to be developed and deployed in East Africa to address some of the more challenging knowledge gaps.

Mots-clés Agrovoc : Bemisia tabaci, écologie animale, dynamique des populations, Manihot esculenta, variété, changement climatique, prédateur, vecteur de maladie, facteur du milieu, gestion des organismes nuisibles, transmission des maladies, virus des végétaux, facteur de risque

Mots-clés géographiques Agrovoc : Afrique orientale, Afrique au sud du Sahara

Mots-clés libres : Cassava, Ecology, Natural enemies, Climate change, Cultivars

Classification Agris : H10 - Ravageurs des plantes

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

Auteurs et affiliations

• Macfadyen S., CSIRO (AUS) - auteur correspondant
• Paull C., CSIRO (AUS)
• Boykin L.M., University of Western Australia (AUS)
• De Barro Paul, CSIRO (AUS)
• Maruthi M.N., University of Greenwich (GBR)
• Otim M.O., NaCRRI (UGA)
• Kalyebi A., NaCRRI (UGA)
• Vassão D.G., MPIZ (DEU)
• Sseruwagi Peter, MARI (TZA)
• Tay Wee Tek, CSIRO (AUS)
• Delatte Hélène, CIRAD-BIOS-UMR PVBMT (REU)
• Seguni Z., MARI (TZA)
• Colvin John, University of Greenwich (GBR)
• Omongo Christopher A., NaCRRI (UGA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/587312/)

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