| Beet armyworm, Spodoptera exigua (Lepidoptera: Noctuidae), also named Laphygma exigua Hubner, is important pest in the world. It has characteristics of wide distribute range, many host plants, strong ability of migration and dispersal, liking warm and ability of abiding high temperature. They distribute between Lat.57°N to Lat.40°S. Beet armyworm is a kind of polyphagous pest, and they can eat 35 families 108 genera, 138 species of plants, including 28 kinds of field crops, 32 kinds of vegetables. Before the eighties of the 20th century, the beet armyworm was only a kind of sporadic pest in our country, but since 1986, beet armyworm has expanded in our country gradually, now, spread provinces and cities in our country more than 20, and have the tendency to expand constantly, cause high disaster frequency, endanger becoming more serious. Based on the insect nutrition ecology theory and in view of the beet armyworm bioecology characteristic, the systemic research of the influence of beet armyworm development, the population dynamics and AChE and CarE activity on protein, sugar and so on the main nutrients and different host plants, the larvae of beet armyworm feeding taxis to the different host plants were conducted. The results were summarized as follows. 1 The influence of different nutrition genes on increase of beet armyworm populationBased on artificial diets, Penman changed the content of protein and dextrose in beet armyworm larva artificial diets by menthod of changing the component and dosage of artificial diets, and observed the influence of different treatments on larval development and adult fecundity. The results showed that the increase of the protein and dextrose content can promote the population of the beet armyworm to increase effectively. With the increase of the protein and dextrose content, larval survival rate increased, larval duration shortened, adult and pupa durations increased, pupa...
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