Radar-based studies of the migratory flight of grasshoppers in the middle Niger area of Mali
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摘要: Some grasshopper species are pests of subsistence agriculture in the Sahelian zone West Africa. Formulation effective control strategies against these requires some knowledge their migratory ability. In this paper a study is described which radar was used to observe aspects nocturnal behaviour grasshoppers middle Niger delta. Mass take-off at dusk, layering and common orientation were regularly observed. Layering appeared be related air temperature. Mean often downwind but other times crosswind headings occurred added southerly component insects' displacement. Probable source areas insects overflying identified by calculations back-trajectories.
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