AN INITIAL METHOD IN APPLICATION OF GIS (GEOGRAPHIC INFORMATION SYSTEM) IN SPATIAL DELINEATION FOR EARLY WARNING THE POTENTIAL RISK OF BROWN RICE PLANT HOPPER (NIVAPARVATA LUGENS). A CASE STUDY IN TRUNGAN VILLAGE, THOTNOT DISTRICT, CANTHO CITY, VIETNAM

摘要

The spatial relationships between clim ate and BPH transm ission was investigated using data collected from 120 different locations within the Trung An village, Thot Not district, Cantho city. A Geographic Inform ation System (GIS) and geostatistic technique were used to monitor the spatial relationship between environm ental and clim atic variables. A Global Positioning System (GPS) was used to record the spatial location of the data. Clim atic evidence suggests that rainfall, maximum and minimum temperature, and relative hum idity are causal aspects in the prevalence of the BPH. Findings from this research investigated the need for village level surveillance of BPH outbreaks, the level at which outbreaks are acknowledged to occur, as opposed to district level surveillance. Rice plant factors, such as number of leaves and the stage of grain maturity, also influence the density of the BPH. The density of BPH was observed to change with the different stages, seasons for rice growth, rice variety, wind direction, etc.