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Effects of changing land use on outbreaks of tropical migratory locust, Locusta migratoria migratorioides (R. & F.)

Published online by Cambridge University Press:  19 September 2011

Roger A. Farrow
Roger A. Farrow
Affiliation:
Division of Entomology, CSIRO, GPO Box 1700, Canberra, A.C.T., Australia 2601
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Abstract

In the major breeding areas of tropical migratory locust, Locusta migratoria migratorioides (R. & F.) in Mali, Chad, Sudan and Madagascar, man has played a vital role in maintaining locust numbers above the levels found in undisturbed environments, through his agricultural and pastoral activities. Recent rapid agricultural development, particularly broad-acre cultivation of mono-cotyledonous summer crops in areas climatically suitable for migratory locust, has caused population upsurges in new areas, which have occasionally led to outbreaks and plagues. Some outbreaks appear to have been a reaction to the initial disturbance and have never recurred while others recur when meteorological conditions are favourable. Continued agricultural development in tropical and sub-tropical areas of the Old World will bring the risk of further upsurges of tropical migratory locust.

Résumé

Dans les principales regions de forte reproduction du criquet migrateur Locusta migratoria migratorioides (R & F), au Mali, Chad, Soudan et Madagascar l'homme, par ses activités agricoles et pastorales, a joué un rôle important dans le maintien du nombre de criquets au dessus des niveaux trouvés dans les terres non cultivées.

Le dévelopement récent et rapide de l'agriculture, particulierement les randes cultures des monocotylédones d'été, dans des régions où le climat est favorable aux criquets migrateurs a permis l'apparition de populations dans de nouvelles regions. Des domages ont été parfois enregistrés. Certains sont apparus par réaction aux pertubations initiées et n ont jamais pu étre réparés alors que dautres s'estompent quand les conditions météorologiques sont favorables.

Le dévelopement continu de l'agriculture dans les régions tropicales et sub-tropicales du Vieux Monde amène le risque d'autres catastrophes causé par le criquet migrateur.

Keywords

Tropical migratory locustLocusta migratoria migratorioides plaguescroppingCriquet migrateurculturesutilisation des terres.
Type
Contributed Papers
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 4-5-6: Recent Advances in Research on Tropical Entomology , December 1987 , pp. 969 - 975
Copyright
Copyright © ICIPE 1987

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References

REFERENCES

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