Abstract: Objective To investigate the status of fly infestation in the urban areas of Xi’an, China, so as to provide a basis for scientific and effective prevention and control of flies.Methods Survey habitats were randomly selected in each of 11 administrative districts in Xi’an. The survey was conducted in both indoor areas and outdoor areas by visual observation. Descriptive statistical analysis was performed using WPS 14309 software. The fly infestation level was evaluated according to the Criteria for Vector Density Control-fly (GB/T 27772-2011).Results A total of 4 475 rooms of eight types of indoor habitats were selected. The rate of fly-positive rooms was 1.72%, and the fly density was 1.79 individuals/room, with the fly density control level being A. Among the habitats, the highest rate of adult fly-positive rooms was 2.48% in farmer’s markets. Among the urban areas, the highest rate of fly-positive rooms was 2.44% in Yanta District. Among the surveyed 722 outdoor habitats, the positive rate of fly breeding sites was 0.42%, with the control level being A. The urban areas harboring fly breeding sites included Huyi, Lianhu, and Weiyang districts, with the control levels all being B. Among the 2 161 fly-proof facilities, the qualified rate was 96.44%, with the control level being B. The qualified rate was lowest in farmer’s markets (92.53%) and Baqiao District (94.63%), where both control levels were C. The fly density control level of urban areas across Xi’an was B.Conclusions The creation of a Healthy City and holding major events can effectively reduce fly density by improving the city’s environmental sanitation of Xi’an and the fly density control level in urban areas of was generally good in 2022. Fly infestation was serious at farmer’s markets with low qualified rates of fly-proof facilities, and also in Yanta and Lianhu districts with a developed catering industry.

Key words: Fly, Infestation, Investigation

摘要： 目的 了解西安市城区蝇类侵害情况,为制定科学有效的蝇类防制措施提供依据。方法 在全市11个市辖区随机抽取调查生境。调查分为室内环境和外环境,采用目测法调查,采用WPS 14309软件进行描述性统计分析,侵害情况按照《病媒生物密度控制水平 蝇类》（GB/T 27772－2011）进行评价。结果 室内共抽取生境8种4 475间房间,有蝇房间阳性率1.72%,蝇密度为1.79只/间,控制水平为A级。成蝇阳性率最高的生境是农贸市场,有蝇房间阳性率为2.48%,阳性率最高的城区是雁塔区,有蝇房间阳性率为2.44%。外环境共抽查生境722处,蝇类孳生地阳性率为0.42%,控制水平为A级,鄠邑、莲湖和未央区发现阳性孳生地,控制水平均为B级。防蝇设施抽查2 161处,合格率为96.44%,控制水平为B级,农贸市场和灞桥区合格率最低,分别为92.53%、94.63%,控制水平均为C级。全市城镇蝇类密度控制水平为B级。结论 西安市创建卫生城市和举办重大活动改善了全市卫生环境,有效降低了蝇类密度,2022年城区蝇密度控制水平较好。但农贸市场防蝇设施合格率不高,蝇类危害较为严重,雁塔区、莲湖区餐饮业发达,蝇类危害较为严重。

关键词: 蝇类, 侵害, 调查