Abstract: The spatial patterns of Plutella xylostella pupae in the critical growing stage of Brassica oleracea were analyzed by geostatistical methods, and the semivariogram curve models in the south\|north orientation were established. The results showed that the semivariogram curves of P. xylostella pupae were fitted with the spherical models at all three sampling dates(October 9, 17 and 31, 2010), and their spatial distribution showed aggregative pattern; the spatial ranges of pupae were 7.91m, 9.10m and 1.74m, respectively, and the spatial discontinuities were 0.5858, 0.3987 and 0.9970, respectively for the three sampling dates．

Key words: Plutella xylostella pupae, spatial pattern, geostatistics