Geostatistic analysis of spatial pattern of the citrus red mite,Panonychus citri(McGregor)(Acarina:Tetranychidae) in citrus orchard

The citrus red mite,Panonychus citri(McGregor),is a key pest of citrus.Geostatistic method was applied to study the spatial pattern of citrus red mite population,in citrus orchard by the spatial analysis software Variowin 2.1.The results indicated that the spatial pattern of citrus red mite population can be described by geostatistic method,and the semivariogram of citrus red mite mainly fitted the gauss models with the ranges of 1.1-21.0 m.Citrus red mite population showed an aggregative distribution,and the aggregating intensities were relatively strong in March,August and September.The spatial pattern dynamics showed that two occurrence peaks of citrus red mite population occurred in April and October,specially in October,citrus red mite population rapidly diffused.March and September were two crucial stages of monitoring and treatment for citrus red mite.