[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.