中文摘要：

2012年7月对广州市九龙镇柑橘园内红火蚁的发生密度进行调查。调查结果显示，柑橘园内的平均蚁巢密度每100m2为7个，红火蚁疫情处于中度危害阶段；地上诱集到红火蚁的诱饵占56．41％，柑橘树上诱集到红火蚁的诱饵占25．96％，红火蚁在柑橘树上的活动程度低于地面。通过调查不仅对准确掌握疫情、科学制定防治策略有实际意义，还为评估红火蚁对柑橘生态系统的影响提供了基础数据。

英文摘要：

To understand the infection of red imported fire ant, Solenopsis invicta Buren, in citrus orchard and control strategy formulation, field survey was conducted in July 2012. Results showed that the mound density was 7 mounds per 100 m2. The red imported fire ant dominated 56.41% of baits on ground and 25.96% baits on trees. This study provided fundamental data for further study on the influence of red imported fire ant on ecosystem in citrus orchard.