Abstract: Batocera horsfieldi is an important poplar stem-borer in south China. Studies on spatial distribution pattern and sampling technique can provide theoretical base for the damage survey and control of B. horsfieldi in poplars. In the study, the spatial distribution pattern of egg, larva, pupa or adult of B. horsfieldi in poplars was analyzed with Taylor’s power law, Iwao’s distribution function, and six aggregation indexes. The results showed that the spatial distribution pattern of egg, larva, pupa or adult of B. horsfieldi in poplars was all aggregated, and the basic component of the distribution was individual colony, and the aggregation intensity was increased with population density. By using the parameters α and β in Iwao’s m*-m regression equation, the optimal and sequential sampling numbers when the oviposition incisions, frass holes and emergence holes were selected as control indexes were determined and can be applied in the field control.

Key words: Batocera horsfieldi, spatial distribution, sampling technique, control indexes, poplar