Meteorological Conditions Inducing Long-Distance Migration of the Brown Planthopper, Nilaparvata lugens Stål

Ryoiti Kisimoto

《中華昆蟲》 4卷2期 (1984/09) Pp. ap5+39-48

https://doi.org/10.6660/TESFE.1984012

摘要

Importance of the long-distance migration of BPH and other small insect pests have ever been increasing. Long-distance movement of BPH can be divided into two main directions, the poleward movement in the spring and equator-directed movement in the autumn. Evidences of the former have been accumulated and the movements were considered to be adaptive. Evidences of the latter have been steadily accumulated but the biological meaning has not been established yet. The whole aspect of the long-distance migration of BPH is consisted of 3 phases, the take-off, long-distance displacement and landing. Taking off usually occurs at a limited period at dawn or dusk under a calm weather. Long-distance displacement is induced by a long-lasting wind of warm and humid which is most likely to occur at the warm sector in a frontal system. Landing is often observed under windy, rainy, or even stormy weather when a frontal system is passing over irrespective of time of the day. Equator-directed movements were observed in late summer to autumn near the frontal system. During summer, particularly in the tropics, trivial flights of BPH are often observed, for example, flight into lights or flight from a rice field to another. Relation between the trivial flight and the long-distance flight has to be analysed.