Geostatistic analysis of spatial pattern of Fruhstorferiola tonkinensis Will(Orthoptera: Catantopidae) nymphs
越北腹露蝗若虫空间格局的地学统计学分析

By the methods of geostatistics, this paper studied the spatial pattern of Fruhstorferiola tonkinensis nymphs in mulberry fields of north Guangdong. The results showed that the semivariogram of F. tonkinensis nymphs at all development stages could be described by spherical model, implying an aggregative distribution, and the range of their spatial correlation was 1.973, 1.968, 2.169, 2.302 and 4.307 m from 1st to 5th instars. Based on the information obtained from investigation site, the isoclines maps of the instars were created by the geostatistical software Surfer 8.0 with Kriging interpolation, and the resulting maps gave a clear indication about the spatial patterns of the instars. Unlike other locusts, the younger instars of F. tonkinensis had an aggregative distribution, while the elder ones were dispersive in distribution.