入秋以来，东北地区哈尔滨、伊春等地出现大量黑色小飞虫聚集现象1。专家确认，这些"小咬"的学名为有翅孤雌蚜，通称有翅蚜1。这种昆虫在春夏季节以无翅形态隐匿在草本植物上，入秋后因草本植被衰败而分化出有翅成虫，进而从草本植物迁飞至木本植物1。
有翅蚜的刺吸式口器无法刺穿人体皮肤，既不会叮咬也不会吸血，更不传播疾病1。专家提示，有翅蚜具有明显的趋色性，偏爱黄色、亮绿色、红色等高饱和颜色，傍晚是其迁飞的高峰时段1。针对此情况，可采取穿着黑、白、灰等素色衣物、骑车时佩戴有面屏的头盔、及时关闭门窗等防护措施来有效避免接触1。
Since autumn began, large concentrations of tiny black flying insects have appeared in northeastern Chinese cities including Harbin and Yichun.1 Experts have identified these insects as winged aphids, scientifically known as winged parthenogenetic aphids, which migrate from herbaceous plants to woody plants as grass vegetation dies back with the season.1 The insects possess piercing-sucking mouthparts incapable of penetrating human skin, meaning they neither bite nor feed on blood, and they do not transmit diseases.1
The winged aphids exhibit distinct color preferences, gravitating toward high-saturation hues such as yellow, bright green, and red.1 Their migration peaks during evening hours.1 To minimize contact with these insects, experts recommend wearing neutral-colored clothing in black, white, or gray tones, wearing helmets with face screens while cycling, and promptly closing doors and windows, particularly during peak migration times.1
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