Use of geographical information systems to analyze large area movement and dispersal of rice insects in South Korea
1994
Song, Y.H. | Heong, K.L. | Lazaro, A.A. | Yeun, K.S. (Gyeong-Sang National Univ., Chinju 660-701 (Korea Republic). Dept. of Agricultural Biology)
The potential use of geographical information systems to analyze pest surveillance data was explored. The Spatial Analysis System (SPANS) TM was used to construct a spatial data base to study pest distributions based on pest surveillance data collected from 152 stations in South Korea. The annual spatial distributions of the striped rice borer (SRB), Chilo suppresalis, showed that area with high densities started to expand in the early 1980s and reached a peak in 1988. The change in pattern appeared to be related to the cultivation of japonica and indica-japonica hybrid varieties of rice in South Korea. Japonica varieties have longer durations, which allows the SRB more time to mature and hibernate in winter. The locus of SRB spread was located in the midwest region near Iri in Chun-Buk. High brown planthopper (BPH) populations in South Korea are often related to immigration during the early rice season in June and to temperature. Simulated distribution of BPH densities in September using these two factors was compared with the actual 1990 distribution. The two density maps corresponds closely except for differences in the southeastern valley. When the simulated map was overlaid with elevation and rice area maps, more specific BPH risk zones could be identified. Several simulated world warming scenarios were also examined. If temperatures increase, BPH risk areas will probably expand both latitudinally and altitudinally
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