Study on the Spatial Distribution Patterns of the Larvae of Apriona swainsoni Hope and Its Applications
Apriona swainsoni Hope is one of the important pests in China′s forest quarantine.It is also a serious pest on Sophora japonica L.The spatial distribution of the larvae of Apriona swainsoni Hope was studied through sampling in 31 plots of Sophora japonica calculating 6 indices of aggregation.Taylor′s power law and Iwao′s regression analysis were also used.The results showed that Apriona swainsoni Hope was in aggregative distribution.Using the parameters X * and K of spatial patterns, the author also analyzed the reasons for the larvae′s aggregation. Based on the ratio of the trees with the larva,the author also established the model and the theoretical sampling formula for estimating the population density.