中文摘要：

采用圆形分布统计方法，对2006年至2008年之间江西省部分地区的柑橘主要病害虫的发生等级进行数据分析，以研究江西省柑橘主要病虫害的时间分布格局.结果表明，不同柑橘病虫害的发生呈现出不同的月份节律，且各病虫害在不同地区发生程度不同.圆形分布统计可用于病虫害及其天敌的昼夜节律和季节节律研究，将为病虫害综合防治提供理论基础.

英文摘要：

Circular statistical methods were used to analyse the occurrence levels of major pests and diseases on Citrus crops be- tween 2006 and 2008 in Jiangxi province, in order to clarify the temporal distribution patterns of citrus diseases and pests. The results show that the occurrence of different citrus diseases and pests had different monthly rhythms, which were also various in different areas. Circular statistics is useful for the study on circadian rhythms and seasonal rhythms of pests and their natural enemies. It will provide a theoretical basis for the integrated management of plant diseases and pests.