Book contents
- Frontmatter
- Contents
- Contributors
- Preface
- Part one Insect migration in relation to weather and climate
- Part two Adaptations for migration
- Part three Forecasting migrant pests
- 15 Operational aspects of forecasting migrant insect pests
- 16 Geographic information systems and remotely sensed data for determining the seasonal distribution of habitats of migrant insect pests
- 17 Forecasting systems for migrant pests. I. The Brown Planthopper Nilaparvata lugens in China
- 18 Forecasting systems for migrant pests. II. The rice planthoppers Nilaparvata lugens and Sogatella furcifera in Japan
- 19 Forecasting systems for migrant pests. III. Locusts and grasshoppers in West Africa and Madagascar
- Part four Overview and synthesis
- Index
19 - Forecasting systems for migrant pests. III. Locusts and grasshoppers in West Africa and Madagascar
Published online by Cambridge University Press: 04 November 2009
- Frontmatter
- Contents
- Contributors
- Preface
- Part one Insect migration in relation to weather and climate
- Part two Adaptations for migration
- Part three Forecasting migrant pests
- 15 Operational aspects of forecasting migrant insect pests
- 16 Geographic information systems and remotely sensed data for determining the seasonal distribution of habitats of migrant insect pests
- 17 Forecasting systems for migrant pests. I. The Brown Planthopper Nilaparvata lugens in China
- 18 Forecasting systems for migrant pests. II. The rice planthoppers Nilaparvata lugens and Sogatella furcifera in Japan
- 19 Forecasting systems for migrant pests. III. Locusts and grasshoppers in West Africa and Madagascar
- Part four Overview and synthesis
- Index
Summary
Introduction
Many acridoid species are known to undertake long-distance migratory flights (Farrow, 1990). The migrations of gregarious-phase locusts are a well-known phenomenon (Rainey, 1951, 1963; Uvarov, 1977; Pedgley, 1981) but those of solitary locusts and grasshoppers have been observed only relatively recently, over the past 30 to 40 years (Golding, 1948; Davey, Descamps & Demange, 1959; Waloff, 1963; Têtefort, Dechappe & Rakotoharison, 1966; Botha & Jansen, 1969; Launois, 1974b; Lecoq, 1975, 1978a,b). For the last 20 years, French scientists now at CIRAD-PRIFAS in Montpellier have studied the factors influencing the migrations of solitary locusts and grasshoppers and their role in the events leading to outbreaks of pest species. The work has led to the development of survey and warning systems for three of these, the Migratory Locust, the Senegalese Grasshopper and, more recently, the Desert Locust (Lecoq, 1991a). This chapter describes the work on the Migratory Locust Locusta migratoria capito in Madagascar (with a brief reference to L. m. migratorioides in West Africa) and the Senegalese Grasshopper Oedaleus senegalensis in West Africa.
Flight movements and a warning system for the Malagasy Migratory Locust
Occurrence and importance of flight movements
In Madagascar, gregarisation of L. m. capito often begins in an extensive outbreak area in the southwest of the country and swarms originating here may subsequently invade the entire island (Fig. 19.1).
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- Insect MigrationTracking Resources through Space and Time, pp. 377 - 396Publisher: Cambridge University PressPrint publication year: 1995
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