Duranton Jean-François, Razafindratsima A., Franc Alex, Lecoq Michel.
2000. Spread of a migratory locust plague in Madagascar.
In : XXI International congress of entomology. Gazzoni D.L. (ed.). EMBRAPA-Soja, SEB
Résumé : Since 1997, Madagascar has been experiencing an outbreak of the Migratory Locust that is the most severe for about fifty years. In spite of vast control operations, both terrestrial and by air, over three years (with financial support from the international community), gregarious residual populations remain in various localities and control will need to continue for at least several months. This outbreak originated in the locust's gregarious area in the southwestern semi-arid zone, between Toliara and Ambovombe. The first outbreak resulted from a sequence of favorable rainfall events. This phenomenon is well known in Madagascar but, for various reasons, caught the authorities unprepared. The initial outbreak at that time restricted to well defined and restricted zones in the gregarious area had been diagnosed from the very start of 1996, but no control measures were undertaken. From this date, the gregarious populations (swamis, hopper bands) progressively invaded northwards and by 1998 the whole island was infested. Observations over the last several years make it possible to provide an outline of this northward progression. The invasion followed a traditional sequence and route, essentially reproducing those of preceding outbreaks - especially those during the periods 1921-29 and 1939-57 (which, however, are much less well documented). The recent data provide a much clearer understanding of how the progression, year by year, relates to the island's ecological zonation. In addition, it seems that recent environment changes have modified some of the invasion routes. with swarms progressing quickly along the cast coast (a naturally forested region now subject to deforestation) for the first time.
Mots-clés Agrovoc : Acrididae, Locusta, infestation
Mots-clés géographiques Agrovoc : Madagascar
Classification Agris : L20 - Écologie animale
H10 - Ravageurs des plantes
Auteurs et affiliations
- Duranton Jean-François, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
- Razafindratsima A., Projet de lutte acridienne (MDG)
- Franc Alex, CNA (MDG)
- Lecoq Michel, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/475777/)
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