异源次生化合物对美洲斑潜蝇种群控制作用的田间试验

应用作用因子生命表方法以及在此基础上提出的干扰作用控制指数法评价了异源植物次生物质在美洲斑潜蝇种群控制中的作用。结果表明，非寄主植物的乙醇提取物（浓度为1gDW·100ml^-1）即马缨丹（Lantana camara）、飞机草（Expatorium odoratum）、蟛蜞菊（Wedelia chinensis）和机油乳剂（C23）对保护菜豆免受美洲斑潜蝇为害起着明显的作用，这些作用物质处理区的干扰作用控制指数分别为0.136、0.163、0.213和0.222，对美洲斑潜蝇的防治效果可达86.4%、83.7%、78.7%和77.8%。同时，这些作用物质不会影响美洲斑潜蝇的寄生性天敌的寄生作用，反而在一定程度上可加强寄生蜂的寄生作用。因此，4种供试作用物质对美洲斑潜蝇种群起着重要的控制作用。

Suppressive effect of secondary substances on Liriomyza sativae population

Life table and interference index of population control (IIPC) were used to evaluate the effects of spraying alcohol extracts of plant secondary substances on the population of Liriomyza sativae .Field experiment results showed that alcohol extracts derived from Lantana camara, Eupatorium odoratum,and Wedelia chinensis,and one kind of commercial petroleum spray oil were positive to protect kidney bean from infestation of L.sativae. The IIPC of these repelling substance compared with control were 0.136, 0.163, 0.213, and 0.222, and the control effects on L. sativae were 86.4%, 83.7%, 78.7%, and 77.8%, respectively. At the same time, the parasitism of vegetable leafminer was increased compared with control, indicated that the effects of parasitism were increased. The results indicated that these substances had strong effects in controlling the population of L. sativae.