Abstract: The species of alfalfa thrips in china and the symptom by its imperiling were reported.The hay yield of alfalfa loses 20.1 percent by this infection. It also causes a decrease in nutritive ingredients.The life cycle and the regu-larity of outbreak of the dominant species—Odontothrips lati Halidays were also reported.The result of pesticides screening experiment showed that 40 percent Roger latex was the best one to controling the thrips,its consistencies were 1:500—1:1000.It would be a main mathod of controling alfalfa thrips that insect—resistant breeding was emphasized.

Key words: alfalfa, thrips, lifecycle, insect resistant breeding

摘要： 本文报道了我国苜蓿蓟马的种类、蓟马危害的症状、因蓟马危害造成苜蓿干草产量损失达20.1%。各种营养成分也有大幅度下降。并报道了优势种牛角花齿蓟马的生活史与发生规律。通过农药的筛选试验、筛选出1:500—1:1000倍的40%乐果乳剂是防治苜蓿蓟马的有效农药,并强调了抗虫育种工作应作为今后防治苜蓿蓟马的主要方法。

关键词: 苜蓿, 蓟马, 生活史, 抗虫育种