Abstract:

In order to control the damage of pest insect on Medicago sativa L., and improve the yield and the quality of Medicago sativa L.. In this paper, the species and population dynamic of main insect pests and their natural enemies on Medicago sativa L. in Jinan were investigated. The results showed that the species of insect pests were abundant from May to August 2011, including 7 orders, 14 families and 33 species. The dominant species of insect pests were Aphididae, Thtipidae, Cicadellidae and Miridae, and the main species of natural pest enemies were Chrysopidae, Coccinellidae and Syrphidae. Aphididae caused severe damages to Medicago sativa L. from May to June, and fewer damages from July to August. Thtipidae invaded alfalfa throughout plant growing season. Two occurrence peaks existed in the invasion of Cicadellidae and Miridae were mid-June and mid-July. The data above provided useful information for controlling the pest insects on Medicago sativa L.