These data have no conflict with the
above conclusions, and the accuracies show that the precision of stepwise
regression is the worst and that SVM is better than the BP neural
network. However, the prediction accuracies of the threemodelsmarkedly
decreased for the following,main reasons: First, the immigration of
L. striatellus into Dongtai in this year was extra large due to the atmospheric
circulation background, Fig. 1 is the average wind field at the
850 hPa level inMay, 2004; it illustrates that during thismonth, a strong
warm wet southwest monsoon was prevailing in the southern main
rice-producing areas