Abstract: Acaricidal activities of acetone extracts from 107 plant species in the northwest area of China against Tetranychina harti were tested with slide-dip method. Result showed that 18 plant extracts with more than 80% corrective mortality (24 h) were toxic to the adult of Tetranychina harti at the concentration of 0.2 g DW·mL^-1. Plant extracts from Syringa oblata, Pistacia chinensis, Rhus chinensis, Abelia dielsii, Ferula bungeana and Oenanthe javanica caused at least 50% mortality (24 h) of Tetranychina harti at the concentration of 0.1 g DW·mL^-1. Further bioassay showed that the LC₅₀ values of the 6 plant extracts were 0.0965, 0.0735, 0.0665, 0.0997, 0.0364 and 0.0762 g DW·mL^-1, respectively. In conclusion, the 6 plant extracts have the great potential of developing botanical acaricides for controlling Tetranychina harti.

Key words: Plant extracts, Acaricidal activity, Tetranychina harti, Botanical acaricide

摘要： 为发现对酢浆草如叶螨（Tetranychina harti）具较高毒杀活性的植物，进一步开发出植物源杀螨剂，以应用于该害螨的安全防治。采用玻片浸渍法测定了西北地区107种植物丙酮提取物对酢浆草如叶螨的毒杀活性。结果表明：供试浓度为0.2 g DW·mL^-1时，西非灰毛豆（Tephrosia vogelii）等18种植物丙酮提取物的毒杀活性较高，校正死亡率（24 h）均在80%以上；降低供试浓度到0.1 g DW·mL^-1时，紫丁香（Syringa oblata）、黄连木（Pistacia chinensis）、盐肤木（Rhus chinensis）、南方六道木（Abelia dielsii）、沙茴香（Ferula bungeana）和水芹（Oenanthe javanica）这6种植物提取物对酢浆草如叶螨的校正死亡率（24 h）仍在50%以上；进一步测定表明这6种植物提取物对酢浆草如叶螨的LC₅₀（24 h）均小于0.1 g DW·mL^-1，分别为0.0965，0.0735，0.0665，0.0997，0.0364和0.0762 g DW·mL^-1。这表明，紫丁香、黄连木、盐肤木、南方六道木、沙茴香和水芹这6种植物对酢浆草如叶螨具有较好的毒杀作用，可作为植物源杀螨剂研制的候选材料，值得进一步研究。

关键词: 植物提取物, 杀螨活性, 酢浆草如叶螨, 植物源杀螨剂