Spodoptera exigua develops 8 generations a year (generation overlapping) in Fuzhou, Fujian Province and the pupae overwinder under the spongy topsoil in the field. The sex ratio is 1∶1.3. A female lays 524-608 eggs on an average. Its development duration under different temperature and threshold temperature of development and effective temperature sum of S.exigua was determined. Determined control effects of 16 kinds of chemical insecticides for the pest showed that Chlorfluazuron and Thiod...