Chang, G.B., Dang, Z.Y., & Yu, C.Y. 1989 [Studies on the spatial distribution pattern of Quadraspidiotus perniciosus.]. Forest Pest and Disease No. 3: 29-30.

Notes: The spatial distribution of the 2nd-instar larvae of Quadraspidiotus perniciosus was tested using diffusion index C, diffusion index Is, Cassie's index CA, Taylor's exponential b and Iwao's m*-m regression analysis methods. The results showed that the spatial distribution was aggregated. The reasons for this were investigated.