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THE FEASIBILITY OF USING VErTICAL-LOOKING rADAr TO MONITOr THE MIGrATION OF BrOWN PLANTHOPPEr AND OTHEr INSECT PESTS OF rICE IN CHINA

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Entomologia Sinica 2003年第1期10卷 1-19页

作者： joe r.riley A.D.Smith D.r.reynolds Plant and Invertebrate Ecology Division Rothamsted ResearchHarpenden Hertfordshire AL5 2JQUKPlant and Invertebrate Ecology DivisionRothamsted ResearchHarpenden Hertfordshire AL5 2JQUKRadar Entomology Unit Plant Animal and Human Health Group Natural Resource s Institute University of Greenwich Central Avenue Chatham Kent ME4 4TB UK

The recent development of automatically operating, inexpensive vertical-looking radar (VLr) for entomological purposes has made it practical to carry out routine, automated monitoring of insect aerial migration throughout the year. In this paper we investigate whether such radars might have a role in monitoring and forecasting schemes designed to improve the management of the Brown Planthopper (BPH), Nilaparvata lugens, and of associated rice pest species in China. A survey of the literature revealed that these insects typically migrate at altitudes between 300 to 2 000 m above ground level, but calculations based on BPH radar scattering cross-sections indicated that the maximum altitude at which they individually produce signals analysable by current VLrs is only～240 m. We also show that coverage over most of the flight altitudes of BPH could be achieved by building a VLr using a wavelength of 8.8 mm instead of the 3.2 cm of existing VLr, but that such a radar would be expensive to build and to operate. We suggest that a more practical solution would be to use a 3.2 cm VLr as a monitor of the aerial movement of the larger species, from which the migration of rice pests in general might be inferred.

关键词： radar migration flight brown planthopper rice pests.

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